commit 2173fc2774defa5fbd8a162319066158d7e79ccf
Author: rgimad <rustem.gimadutdinov@gmail.com>
Date:   Thu Mar 7 02:02:03 2024 +0300

    first commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b69261a
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+*.exe
+*.img
+*.code-workspace
+*.zip
\ No newline at end of file
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..7160d70
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,18 @@
+KTCC_DIR = ../../develop/ktcc/trunk
+KLIBC = ../../develop/ktcc/trunk/libc.obj
+
+NAME = dino
+
+KTCC = $(KTCC_DIR)/bin/kos32-tcc
+KPACK = kpack
+
+SRC = $(wildcard *.c)
+FLAGS= -B$(KTCC_DIR)/bin -I $(KLIBC)/include 
+LIBS = -limg
+
+all: $(SRC)
+	$(KTCC) $(FLAGS) $(SRC) $(LIBS) -o $(NAME)
+# $(KPACK) $(NAME)
+
+clean:
+	rm $(NAME)
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b09e2c0
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+## Dino
+T-Rex Runner game from Chrome browser, rewritten in C
diff --git a/cloud.c b/cloud.c
new file mode 100644
index 0000000..e695ec5
--- /dev/null
+++ b/cloud.c
@@ -0,0 +1,34 @@
+#include "cloud.h"
+
+void cloudInit(Cloud* cloud, int w) {
+	cloud->width = w;
+	cloud->xPos = w;
+	cloud->yPos = 0;
+	cloud->remove = false;
+	cloud->cloudGap = getRandomNumber(CLOUD_MIN_GAP, CLOUD_MAX_GAP);
+
+	cloud->yPos = getRandomNumber(CLOUD_MAX_SKY_LEVEL, CLOUD_MIN_SKY_LEVEL); // NOTE why swapped
+	cloudDraw(cloud);
+}
+
+void cloudDraw(const Cloud* cloud) {
+	graphicsBlitAtlasImage(ATLAS_CLOUD_X, ATLAS_CLOUD_Y, cloud->xPos, cloud->yPos, CLOUD_WIDTH, CLOUD_HEIGHT, false);
+}
+
+void cloudUpdate(Cloud* cloud, double speed) {
+	// printf("cloudUpdate(., %f)\n", speed);
+	if (!cloud->remove) {
+		cloud->xPos -= (int)ceil(speed);
+		cloudDraw(cloud);
+
+		// Mark as removeable if no longer in the canvas.
+		if (!cloudIsVisible(cloud)) {
+			cloud->remove = true;
+		}
+	}
+}
+
+bool cloudIsVisible(const Cloud* cloud) {
+	return cloud->xPos + CLOUD_WIDTH > 0;
+}
+
diff --git a/cloud.h b/cloud.h
new file mode 100644
index 0000000..604653a
--- /dev/null
+++ b/cloud.h
@@ -0,0 +1,29 @@
+#ifndef CLOUD_H
+#define CLOUD_H
+
+#include <stdbool.h>
+#include <math.h>
+#include "graphics.h"
+#include "misc.h"
+
+#define CLOUD_WIDTH 46
+#define CLOUD_HEIGHT 14
+#define CLOUD_MAX_GAP 400
+#define CLOUD_MAX_SKY_LEVEL 30
+#define CLOUD_MIN_GAP 100
+#define CLOUD_MIN_SKY_LEVEL 71
+
+typedef struct {
+	int width;
+	int xPos;
+	int yPos;
+	bool remove;
+	int cloudGap;
+} Cloud;
+
+void cloudInit(Cloud* cloud, int w);
+void cloudDraw(const Cloud* cloud);
+void cloudUpdate(Cloud* cloud, double speed);
+bool cloudIsVisible(const Cloud* cloud);
+
+#endif
diff --git a/collisionbox.h b/collisionbox.h
new file mode 100644
index 0000000..e9e74ab
--- /dev/null
+++ b/collisionbox.h
@@ -0,0 +1,11 @@
+#ifndef COLLISIONBOX_H
+#define COLLISIONBOX_H
+
+typedef struct {
+    int x;
+    int y;
+    int width;
+    int height;
+} CollisionBox;
+
+#endif
diff --git a/config.h b/config.h
new file mode 100644
index 0000000..6c23045
--- /dev/null
+++ b/config.h
@@ -0,0 +1,7 @@
+#ifndef CONFIG_H
+#define CONFIG_H
+
+#define DEFAULT_WIDTH 600
+#define FPS 60
+
+#endif
diff --git a/dino b/dino
new file mode 100644
index 0000000..3677301
Binary files /dev/null and b/dino differ
diff --git a/distance_meter.c b/distance_meter.c
new file mode 100644
index 0000000..18465cb
--- /dev/null
+++ b/distance_meter.c
@@ -0,0 +1,134 @@
+#include "distance_meter.h"
+
+DistanceMeter distanceMeter;
+
+void distanceMeterInit(int w) {
+	distanceMeter.x = 0;
+	distanceMeter.y = 5;
+	distanceMeter.currentDistance = 0;
+	distanceMeter.maxScore = 0;
+	distanceMeter.achievement = false;
+	distanceMeter.flashTimer = 0;
+	distanceMeter.flashIterations = 0;
+	distanceMeter.invertTrigger = false;
+	distanceMeter.maxScoreUnits = DM_MAX_DISTANCE_UNITS;
+	distanceMeterCalcXPos(w);
+	for (int i = 0; i < distanceMeter.maxScoreUnits; i++) {
+		distanceMeterDraw(i, 0, false);
+	}
+	distanceMeter.maxScore = (int)pow(10, distanceMeter.maxScoreUnits) - 1;
+	distanceMeter.digits[0] = '\0';
+	distanceMeter.highScore[0] = '\0';
+}
+
+void distanceMeterCalcXPos(int w) {
+	distanceMeter.x = w - (DM_DEST_WIDTH * (distanceMeter.maxScoreUnits + 1));
+}
+
+void distanceMeterDraw(int digitPos, int value, bool opt_highscore) {
+
+	int dx, dy;
+	if (opt_highscore) {
+		dx = distanceMeter.x - (distanceMeter.maxScoreUnits * 2) * DM_WIDTH;
+		dy = distanceMeter.y;
+	}
+	else {
+		dx = distanceMeter.x;
+		dy = distanceMeter.y;
+	}
+	//printf("%d %d %d  %d %d    %d\n", digitPos, value, opt_highscore, dx, dy, DM_WIDTH * value + ATLAS_TEXT_SPRITE_X);
+	graphicsBlitAtlasImage(
+		DM_WIDTH * value + ATLAS_TEXT_SPRITE_X,
+		0 + ATLAS_TEXT_SPRITE_Y,
+		digitPos * DM_DEST_WIDTH + dx,
+		distanceMeter.y + dy,
+		DM_WIDTH,
+		DM_HEIGHT,
+		false
+	);
+}
+
+void distanceMeterDrawHighScore() {
+	// TODO canvasCtx.globalAlpha = .8;
+	for (int i = (int)strlen(distanceMeter.highScore) - 1; i >= 0; i--) {
+		distanceMeterDraw(i, distanceMeter.highScore[i] > 12 ? distanceMeter.highScore[i] - '0' : distanceMeter.highScore[i], true);
+	}
+}
+
+void distanceMeterSetHighScore(int _distance) {
+	int distance = distanceMeterGetActualDistance(_distance);
+	distanceMeter.highScore[0] = 10;
+	distanceMeter.highScore[1] = 11;
+	distanceMeter.highScore[2] = 12;
+	intToStr(distance, distanceMeter.maxScoreUnits, distanceMeter.highScore + 3);
+}
+
+void distanceMeterReset() {
+	distanceMeterUpdate(0, 0);
+	distanceMeter.achievement = false;
+}
+
+int distanceMeterGetActualDistance(int distance) {
+	return distance ? (int)round(distance * DM_COEFFICIENT) : 0;
+}
+
+bool distanceMeterUpdate(int deltaTime, int _distance) {
+	bool paint = true;
+	bool playSound = false;
+	int distance = _distance;
+	if (!distanceMeter.achievement) {
+		distance = distanceMeterGetActualDistance(_distance);
+		// check if score has gone beyond the initial digit count.
+		if (distance > distanceMeter.maxScore && distanceMeter.maxScoreUnits == DM_MAX_DISTANCE_UNITS) {
+			distanceMeter.maxScoreUnits++;
+			distanceMeter.maxScore = distanceMeter.maxScore * 10 + 9;
+		}
+		// else {
+			// this.distance was in original but i didsnt see any usage of this field
+		// }
+
+		if (distance > 0) {
+			// Acheivement unlocked
+			if (distance % DM_ACHIEVEMENT_DISTANCE == 0) {
+				// Flash score and play sound
+				distanceMeter.achievement = true;
+				distanceMeter.flashTimer = 0;
+				playSound = true;
+			}
+			// Create a string representation of the distance with leading 0.
+			intToStr(distance, distanceMeter.maxScoreUnits, distanceMeter.digits);
+		}
+		else {
+			intToStr(0, distanceMeter.maxScoreUnits, distanceMeter.digits);
+		}
+	}
+	else {
+		// Control flashing of the score on reaching acheivement.
+		if (distanceMeter.flashIterations <= DM_FLASH_ITERATIONS) {
+			distanceMeter.flashTimer += deltaTime;
+
+			if (distanceMeter.flashTimer < DM_FLASH_DURATION) {
+				paint = false;
+			}
+			else if (distanceMeter.flashTimer > DM_FLASH_DURATION * 2) {
+				distanceMeter.flashTimer = 0;
+				distanceMeter.flashIterations++;
+			}
+		}
+		else {
+			distanceMeter.achievement = false;
+			distanceMeter.flashIterations = 0;
+			distanceMeter.flashTimer = 0;
+		}
+	}
+
+	// Draw the digits if not flashing
+	if (paint) {
+		for (int i = distanceMeter.maxScoreUnits - 1; i >= 0; i--) {
+			distanceMeterDraw(i, (int)distanceMeter.digits[i] - '0', false);
+		}
+	}
+
+	distanceMeterDrawHighScore();
+	return playSound;
+}
diff --git a/distance_meter.h b/distance_meter.h
new file mode 100644
index 0000000..2efa11b
--- /dev/null
+++ b/distance_meter.h
@@ -0,0 +1,44 @@
+#ifndef DISTANCE_METER_H
+#define DISTANCE_METER_H
+
+#include <stdbool.h>
+#include <string.h>
+#include <math.h>
+#include "graphics.h"
+#include "misc.h"
+
+#define DM_MAX_DISTANCE_UNITS 5
+#define DM_ACHIEVEMENT_DISTANCE 100
+#define DM_COEFFICIENT 0.025
+#define DM_FLASH_DURATION 1000/4
+#define DM_FLASH_ITERATIONS 3
+#define DM_WIDTH 10
+#define DM_HEIGHT 13
+#define DM_DEST_WIDTH 11
+
+typedef struct {
+	int x;
+	int y;
+	int currentDistance;
+	int maxScore;
+	char digits[16];
+	char highScore[16];
+	bool achievement;
+	int flashTimer;
+	int flashIterations;
+	bool invertTrigger;
+	int maxScoreUnits;
+} DistanceMeter;
+
+extern DistanceMeter distanceMeter;
+
+void distanceMeterInit(int w);
+void distanceMeterCalcXPos(int w);
+void distanceMeterDraw(int digitPos, int value, bool opt_highscore);
+int distanceMeterGetActualDistance(int distance);
+bool distanceMeterUpdate(int deltaTime, int _distance);
+void distanceMeterDrawHighScore();
+void distanceMeterSetHighScore(int _distance);
+void distanceMeterReset();
+
+#endif
diff --git a/game_over_panel.c b/game_over_panel.c
new file mode 100644
index 0000000..ba9fefa
--- /dev/null
+++ b/game_over_panel.c
@@ -0,0 +1,22 @@
+#include "game_over_panel.h"
+
+GameOverPanel gameOverPanel;
+
+void gameOverPanelInit(int width, int height) {
+	gameOverPanel.width = width;
+	gameOverPanel.height = height;
+}
+
+void gameOverPanelDraw() {
+    double centerX = gameOverPanel.width / 2;
+    int textTargetX = (int)round(centerX - (GOP_TEXT_WIDTH / 2));
+    int textTargetY = (int)round((gameOverPanel.height - 25) / 3);
+    int restartTargetX = centerX - (GOP_RESTART_WIDTH / 2);
+    int restartTargetY = gameOverPanel.height / 2;
+    // Game over text from sprite
+    graphicsBlitAtlasImage(GOP_TEXT_X + ATLAS_TEXT_SPRITE_X, GOP_TEXT_Y + ATLAS_TEXT_SPRITE_Y,
+        textTargetX, textTargetY, GOP_TEXT_WIDTH, GOP_TEXT_HEIGHT, false);
+    // Restart button
+    graphicsBlitAtlasImage(ATLAS_RESTART_X, ATLAS_RESTART_Y,
+        restartTargetX, restartTargetY, GOP_RESTART_WIDTH, GOP_RESTART_HEIGHT, false);
+}
diff --git a/game_over_panel.h b/game_over_panel.h
new file mode 100644
index 0000000..8644482
--- /dev/null
+++ b/game_over_panel.h
@@ -0,0 +1,24 @@
+#ifndef GAME_OVER_PANEL_H
+#define GAME_OVER_PANEL_H
+
+#include <math.h>
+#include "graphics.h"
+
+#define GOP_TEXT_X 0
+#define GOP_TEXT_Y 13
+#define GOP_TEXT_WIDTH 191
+#define GOP_TEXT_HEIGHT 11
+#define GOP_RESTART_WIDTH 36
+#define GOP_RESTART_HEIGHT 32
+
+typedef struct {
+	int width;
+	int height;
+} GameOverPanel;
+
+extern GameOverPanel gameOverPanel;
+
+void gameOverPanelInit(int width, int height);
+void gameOverPanelDraw();
+
+#endif
diff --git a/graphics.c b/graphics.c
new file mode 100644
index 0000000..3cc531e
--- /dev/null
+++ b/graphics.c
@@ -0,0 +1,61 @@
+#include "graphics.h"
+#include "sprites.h"
+
+static ksys_colors_table_t sys_color_table;
+static ksys_pos_t win_pos;
+static Image* screenImage;
+static Image* spriteAtlas;
+
+
+void graphicsInit() {
+    win_pos = _ksys_get_mouse_pos(KSYS_MOUSE_SCREEN_POS);
+    _ksys_get_system_colors(&sys_color_table);
+    spriteAtlas = img_decode((void*)sprites100, sizeof(sprites100), 0);
+    *((uint8_t*)spriteAtlas->Palette + 3) = 0; // set black as transparent
+    // for (int i = 0; i < 16; i++) {
+    //     debug_printf("%x\n", *((uint8_t*)spriteAtlas->Palette + i));
+    // }
+    if (spriteAtlas->Type != IMAGE_BPP32) {
+        spriteAtlas = img_convert(spriteAtlas, NULL, IMAGE_BPP32, 0, 0);
+        if (!spriteAtlas) {
+            debug_printf("spriteAtlas convert error\n");
+            exit(-1);
+        }
+    }
+    debug_printf("spriteAtlas->Type = %d\n", spriteAtlas->Type);
+    screenImage = img_create(DEFAULT_WIDTH, 200, IMAGE_BPP32);
+}
+
+void graphicsBlitAtlasImage(int atlasX, int atlasY, int destX, int destY, int w, int h, bool center) {
+    // debug_printf("start graphicsBlitAtlasImage %d %d %d %d %d %d %x %x\n", atlasX, atlasY, destX, destY, w, h, screenImage, spriteAtlas);
+    if (destX < 0 || destY < 0) {
+        return;
+    }
+    img_blend(screenImage, spriteAtlas, destX, destY, atlasX, atlasY, w, h);
+    // debug_printf("end graphicsBlitAtlasImage\n\n");
+}
+
+void graphicsFillBackground(unsigned r, unsigned g, unsigned b) {
+    img_fill_color(screenImage, screenImage->Width, screenImage->Height, (0xFF << 24) | (r << 16) | (g << 8) | b);
+}
+
+void graphicsRender() {
+    _ksys_start_draw();
+    _ksys_create_window(win_pos.x, win_pos.y, screenImage->Width + 10, screenImage->Height + 29, "DINO", sys_color_table.work_area, 0x54); // 0x54. note: C = 1 !!
+    img_draw(screenImage, 5, 24, screenImage->Width, screenImage->Height, 0, 0);
+    //ksys_draw_bitmap_palette(screenImage->Data, 5, 24, screenImage->Width, screenImage->Height, 32, 0, 0);
+    // ksys_blitter_params_t bp = {5, 24, screenImage->Width, screenImage->Height, 0, 0, screenImage->Width, screenImage->Height, screenImage->Data, screenImage->Width*4};
+    // _ksys_blitter(0, &bp);
+    _ksys_end_draw();
+}
+
+void graphicsDelay(int ms) {
+    // debug_printf("ms = %d\n", ms);
+    _ksys_delay(ms/10 ? ms/10 : 2);
+}
+
+
+void graphicsDestroy() {
+    img_destroy(screenImage);
+    img_destroy(spriteAtlas);
+}
diff --git a/graphics.h b/graphics.h
new file mode 100644
index 0000000..61c4d44
--- /dev/null
+++ b/graphics.h
@@ -0,0 +1,43 @@
+#ifndef GRAPHICS_H
+#define GRAPHICS_H
+
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+
+#include <sys/ksys.h>
+#include <clayer/libimg.h>
+
+#include <stdio.h>
+
+#include "config.h"
+
+#define ATLAS_CACTUS_LARGE_X 332
+#define ATLAS_CACTUS_LARGE_Y 2
+#define ATLAS_CACTUS_SMALL_X 228
+#define ATLAS_CACTUS_SMALL_Y 2
+#define ATLAS_CLOUD_X 86
+#define ATLAS_CLOUD_Y 2
+#define ATLAS_HORIZON_X 2
+#define ATLAS_HORIZON_Y 54
+#define ATLAS_MOON_X 484
+#define ATLAS_MOON_Y 2
+#define ATLAS_PTERODACTYL_X 134
+#define ATLAS_PTERODACTYL_Y 2
+#define ATLAS_RESTART_X 2
+#define ATLAS_RESTART_Y 2
+#define ATLAS_TEXT_SPRITE_X 655
+#define ATLAS_TEXT_SPRITE_Y 2
+#define ATLAS_TREX_X 848
+#define ATLAS_TREX_Y 2
+#define ATLAS_STAR_X 645
+#define ATLAS_STAR_Y 2
+
+void graphicsInit();
+void graphicsBlitAtlasImage(int atlasX, int atlasY, int destX, int destY, int w, int h, bool center);
+void graphicsFillBackground(unsigned r, unsigned g, unsigned b);
+void graphicsRender();
+void graphicsDelay(int ms);
+void graphicsDestroy();
+
+#endif
diff --git a/horizon.c b/horizon.c
new file mode 100644
index 0000000..65b2905
--- /dev/null
+++ b/horizon.c
@@ -0,0 +1,144 @@
+#include "horizon.h"
+
+Horizon horizon;
+
+void horizonInit(int dim_width, double gapCoefficient) {
+	horizon.dim_width = dim_width;
+	horizon.gapCoefficient = gapCoefficient;
+	horizon.obstacles = ulist_create();
+	horizon.obstacleHistory = ulist_create();
+	horizon.clouds = ulist_create();
+
+	horizonAddCloud();
+
+    horizonLineInit();
+}
+
+void horizonUpdate(int deltaTime, double currentSpeed, bool updateObstacles, bool showNightMode) {
+	// horizon.runningTime += deltaTime;
+	horizonLineUpdate(deltaTime, currentSpeed);
+	// horizon.nightMode.update(showNightMode);
+	horizonUpdateClouds(deltaTime, currentSpeed);
+	if (updateObstacles) {
+		horizonUpdateObstacles(deltaTime, currentSpeed);
+	}
+}
+
+void horizonUpdateClouds(int deltaTime, double speed) {
+    //printf("horizonUpdateClouds()\n");
+    double cloudSpeed = HORIZON_BG_CLOUD_SPEED / 1000 * deltaTime * speed;
+    int numClouds = ulist_size(horizon.clouds);
+    //printf("horizonUpdateClouds() %d\n", numClouds);
+
+    if (numClouds) {
+        Node *cloudNode = horizon.clouds->tail;
+        while (cloudNode != NULL) {
+            cloudUpdate(cloudNode->data, cloudSpeed);
+            cloudNode = cloudNode->prev;
+        }
+        Cloud *lastCloud = horizon.clouds->tail->data;
+        // Check for adding a new cloud
+        if (numClouds < HORIZON_MAX_CLOUDS && (horizon.dim_width - lastCloud->xPos) > lastCloud->cloudGap && HORIZON_CLOUD_FREQUENCY > (double)rand()/RAND_MAX) {
+            horizonAddCloud();
+        }
+        // Remove expired clouds
+        cloudNode = horizon.clouds->head;
+        while (cloudNode != NULL) {
+            Node* cloudNodeNext = cloudNode->next;
+            Cloud* c = cloudNode->data;
+            if (c->remove) {
+                ulist_remove(horizon.clouds, cloudNode);
+            }
+            cloudNode = cloudNodeNext;
+        }
+    }
+    else {
+        horizonAddCloud();
+    }
+}
+
+void horizonUpdateObstacles(int deltaTime, double currentSpeed) {
+    //printf("horizonUpdateObstacles()\n");
+    // Obstacles, move to Horizon layer
+    Node* obNode = horizon.obstacles->head;
+    while (obNode != NULL) {
+        Node* obNodeNext = obNode->next;
+        Obstacle* ob = obNode->data;
+        obstacleUpdate(ob, deltaTime, currentSpeed);
+        // Clean up existing obstacles
+        if (ob->remove) {
+            //ulist_remove(horizon.obstacles, obNode);
+            //ulist_print(horizon.obstacles);
+            ulist_remove_front(horizon.obstacles);
+            //ulist_print(horizon.obstacles);
+            //puts("");
+        }
+        obNode = obNodeNext;
+    }
+
+    if (ulist_size(horizon.obstacles) > 0) {
+        Obstacle *lastObstacle = horizon.obstacles->tail->data;
+
+        if (lastObstacle && !lastObstacle->followingObstacleCreated && obstacleIsVisible(lastObstacle) && (lastObstacle->xPos + lastObstacle->width + lastObstacle->gap) < horizon.dim_width) {
+            horizonAddNewObstacle(currentSpeed);
+            lastObstacle->followingObstacleCreated = true;
+        }
+    }
+    else {
+        // Create new obstacles.
+        horizonAddNewObstacle(currentSpeed);
+    }
+}
+
+void horizonAddNewObstacle(double currentSpeed) {
+    int obstacleTypeIndex = getRandomNumber(0, sizeof(obstacleTypeConfigs)/sizeof(ObstacleTypeConfig) - 1);
+    ObstacleTypeConfig *otc = &obstacleTypeConfigs[obstacleTypeIndex];
+
+    // Check for multiples of the same type of obstacle.
+    // Also check obstacle is available at current speed.
+    if (horizonDuplicateObstacleCheck(otc->type) || currentSpeed < otc->minSpeed) {
+        horizonAddNewObstacle(currentSpeed);
+    }
+    else {
+        Obstacle* ob = malloc(sizeof(Obstacle));
+        obstacleInit(ob, otc, horizon.dim_width, horizon.gapCoefficient, currentSpeed, otc->width);
+        ulist_push_back(horizon.obstacles, ob);
+        ulist_push_front(horizon.obstacleHistory, &(otc->type));
+        if (ulist_size(horizon.obstacleHistory) > 1) {
+            ulist_splice(horizon.obstacleHistory, RUNNER_MAX_OBSTACLE_DUPLICATION);
+        }
+    }
+}
+
+bool horizonDuplicateObstacleCheck(ObstacleType nextObstacleType) {
+    //printf("horizonDuplicateObstacleCheck(%d)\n", nextObstacleType);
+    int duplicateCount = 0;
+    Node* ohNode = horizon.obstacleHistory->head;
+    while (ohNode != NULL) {
+        //printf("%d\n", *(int*)ohNode->data);
+        duplicateCount = *(int*)ohNode->data == nextObstacleType ? duplicateCount + 1 : 0;
+        ohNode = ohNode->next;
+    }
+    //printf("duplicateCount = %d\n\n", duplicateCount);
+    return duplicateCount >= RUNNER_MAX_OBSTACLE_DUPLICATION;
+}
+
+void horizonReset() {
+    // printf("horizonReset() !!\n");
+    ulist_destroy(horizon.obstacles);
+    horizon.obstacles = ulist_create();
+    horizonLineReset();
+}
+
+//void horizonResize(int width, int height) {
+//    
+//}
+
+void horizonAddCloud() {
+    Cloud* c = malloc(sizeof(Cloud));
+    cloudInit(c, horizon.dim_width);
+    //printf("horizonAddCloud() %d -> ", ulist_size(horizon.obstacles));
+    ulist_push_back(horizon.clouds, c);
+    //printf("%d\n", ulist_size(horizon.obstacles));
+}
+
diff --git a/horizon.h b/horizon.h
new file mode 100644
index 0000000..7855ab8
--- /dev/null
+++ b/horizon.h
@@ -0,0 +1,41 @@
+#ifndef HORIZON_H
+#define HORIZON_H
+
+#include <math.h>
+#include <stdbool.h>
+#include "obstacle.h"
+#include "cloud.h"
+#include "horizon_line.h"
+#include "runner.h"
+#include "graphics.h"
+#include "ulist.h"
+
+#define HORIZON_BG_CLOUD_SPEED 0.2
+#define HORIZON_BUMPY_THRESHOLD 0.3
+#define HORIZON_CLOUD_FREQUENCY 0.5
+#define HORIZON_HORIZON_HEIGHT 16
+#define HORIZON_MAX_CLOUDS 6
+
+typedef struct {
+	int dim_width;
+	double gapCoefficient;
+	Ulist* obstacles;
+	Ulist* obstacleHistory;
+	// nightMode
+	Ulist* clouds;
+} Horizon;
+
+extern Horizon horizon;
+
+void horizonInit(int dim_width, double gapCoefficient);
+void horizonUpdate(int deltaTime, double currentSpeed, bool updateObstacles, bool showNightMode);
+void horizonUpdateClouds(int deltaTime, double speed);
+void horizonUpdateObstacles(int deltaTime, double currentSpeed);
+//void horizonRemoveFirstObstacle();
+void horizonAddNewObstacle(double currentSpeed);
+bool horizonDuplicateObstacleCheck(ObstacleType nextObstacleType);
+void horizonReset();
+//void horizonResize(int width, int height);
+void horizonAddCloud();
+
+#endif
diff --git a/horizon_line.c b/horizon_line.c
new file mode 100644
index 0000000..46fe45d
--- /dev/null
+++ b/horizon_line.c
@@ -0,0 +1,55 @@
+#include "horizon_line.h"
+
+HorizonLine horizonLine;
+
+void horizonLineInit() {
+	horizonLine.width = HORIZON_LINE_WIDTH;
+	horizonLine.height = HORIZON_LINE_HEIGHT;
+	horizonLine.sourceXPos[0] = ATLAS_HORIZON_X;
+	horizonLine.sourceXPos[1] = ATLAS_HORIZON_X + horizonLine.width;
+	horizonLine.bumpThreshold = 0.5;
+	horizonLine.xPos[0] = 0;
+	horizonLine.xPos[1] = horizonLine.width;
+	horizonLine.yPos = HORIZON_LINE_YPOS;
+	horizonLineDraw();
+}
+
+void horizonLineDraw() {
+	//printf("horizonLineDraw(); xPos[0] = %d, xPos[1] = %d, yPos = %d, width = %d, height = %d\n", horizonLine.xPos[0], horizonLine.xPos[1], horizonLine.yPos, horizonLine.width, horizonLine.height);
+	graphicsBlitAtlasImage(horizonLine.sourceXPos[0], ATLAS_HORIZON_Y, horizonLine.xPos[0], horizonLine.yPos, horizonLine.width, horizonLine.height, false);
+	graphicsBlitAtlasImage(horizonLine.sourceXPos[1], ATLAS_HORIZON_Y, horizonLine.xPos[1], horizonLine.yPos, horizonLine.width, horizonLine.height, false);
+}
+
+int horizonLineGetRandomType() {
+	return (double)rand() / RAND_MAX > horizonLine.bumpThreshold ? horizonLine.width : 0;
+}
+
+void horizonLineUpdateXPos(int pos, int increment) {
+	int line1 = pos;
+	int line2 = pos == 0 ? 1 : 0;
+
+	horizonLine.xPos[line1] -= increment;
+	horizonLine.xPos[line2] = horizonLine.xPos[line1] + horizonLine.width;
+
+	if (horizonLine.xPos[line1] <= -horizonLine.width) {
+		horizonLine.xPos[line1] += horizonLine.width * 2;
+		horizonLine.xPos[line2] = horizonLine.xPos[line1] - horizonLine.width;
+		horizonLine.sourceXPos[line1] = horizonLineGetRandomType() + ATLAS_HORIZON_X;
+	}
+}
+
+void horizonLineUpdate(int deltaTime, double speed) {
+	int increment = floor(speed * (FPS / 1000.0) * deltaTime);
+	if (horizonLine.xPos[0] <= 0) {
+		horizonLineUpdateXPos(0, increment);
+	}
+	else {
+		horizonLineUpdateXPos(1, increment);
+	}
+	horizonLineDraw();
+}
+
+void horizonLineReset() {
+	horizonLine.xPos[0] = 0;
+	horizonLine.xPos[1] = horizonLine.width;
+}
diff --git a/horizon_line.h b/horizon_line.h
new file mode 100644
index 0000000..d650ff8
--- /dev/null
+++ b/horizon_line.h
@@ -0,0 +1,33 @@
+#ifndef HORIZON_LINE_H
+#define HORIZON_LINE_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <math.h>
+#include "config.h"
+#include "graphics.h"
+
+#define HORIZON_LINE_WIDTH 600
+#define HORIZON_LINE_HEIGHT 12
+#define HORIZON_LINE_YPOS 127
+
+typedef struct {
+	int width;
+	int height;
+	int sourceXPos[2];
+	int xPos[2];
+	int yPos;
+	double bumpThreshold;
+} HorizonLine;
+
+extern HorizonLine horizonLine;
+
+void horizonLineInit();
+void horizonLineDraw();
+int horizonLineGetRandomType();
+void horizonLineUpdateXPos(int pos, int increment);
+void horizonLineUpdate(int deltaTime, double speed);
+void horizonLineReset();
+
+#endif
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..4a8906a
--- /dev/null
+++ b/main.c
@@ -0,0 +1,125 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include <sys/ksys.h>
+
+#include "misc.h"
+#include "graphics.h"
+#include "distance_meter.h"
+#include "cloud.h"
+#include "obstacle.h"
+#include "horizon_line.h"
+#include "trex.h"
+#include "runner.h"
+
+#pragma warning(disable:4996)
+
+uint8_t keyboard_layout[128];
+
+int main(int argc, char* args[]) {
+	srand((unsigned int)time(NULL)); // Seed the random number generator
+
+	graphicsInit();
+
+	runnerInit();
+
+	_ksys_debug_puts("3333333");
+	_ksys_debug_puts("xABCDEFuuit56\n\n");
+
+	_ksys_set_event_mask(0xC0000027); // !
+	_ksys_set_key_input_mode(KSYS_KEY_INPUT_MODE_SCANC);
+	_ksys_keyboard_layout(KSYS_KEYBOARD_LAYOUT_NORMAL, keyboard_layout);
+
+	uint32_t kos_event;	
+	int ext_code = 0;
+    uint8_t old_mode = 0;
+
+	bool quit = false;
+	while (quit == false) {
+		int frameStartTime = getTimeStamp();
+		//printf("frameStartTime = %d\n", frameStartTime);
+        kos_event = _ksys_check_event();
+        switch (kos_event) {
+		case KSYS_EVENT_BUTTON:
+			switch (_ksys_get_button()){
+			case 1:
+				quit = true;
+				break;
+			default:
+				break;
+			}
+			break;
+		case KSYS_EVENT_KEY:
+			{
+				ksys_oskey_t key = _ksys_get_key();
+				uint8_t scancode = key.code;
+				if (scancode == 0xE0 || scancode == 0xE1) {
+                    ext_code = scancode;
+                    break;
+                }
+                if (ext_code == 0xE1 && (scancode & 0x7F) == 0x1D) {
+                    break;
+                }
+                if (ext_code == 0xE1 && scancode == 0xC5) {
+                    ext_code = 0;
+                    break;
+                }
+                uint8_t code = keyboard_layout[scancode & 0x7F];
+ 
+                if (ext_code == 0xE0) {
+					code -= 96;
+				}
+                ext_code = 0;
+				
+				if (scancode < 128) { // KEYDOWN
+					//debug_printf("Keydown: key = 0x%x, scancode = 0x%x, code = 0x%x (%u) state = 0x%x\n", key.val, scancode, code, code, key.state);
+					runnerOnKeyDown(code);
+				} else { // KEYUP
+					//debug_printf("Keyup: key = 0x%x, scancode = 0x%x, code = 0x%x (%u) state = 0x%x\n", key.val, scancode, code, code, key.state);
+					runnerOnKeyUp(code);
+				}
+			}
+			break;
+		// case SDL_KEYDOWN:
+		// 	//printf("DOWN%d ", event.key.keysym.sym & 0xFF);
+		// 	runnerOnKeyDown(event.key.keysym.sym & 0xFF);
+		// 	break;
+		// case SDL_KEYUP:
+		// 	//printf("UP%d ", event.key.keysym.sym & 0xFF);
+		// 	runnerOnKeyUp(event.key.keysym.sym & 0xFF);
+		// 	break;
+		case KSYS_EVENT_REDRAW:
+			graphicsRender();
+			break; 
+		default:
+			break;
+		}
+		if (runner.nextUpdateScheduled) {
+			//printf("runner update! %u\n", getTimeStamp());
+			runnerUpdate();
+		}
+		else {
+			if (runner.skipUpdateNow) {
+				//printf("Skipped one update\n");
+				runner.nextUpdateScheduled = true;
+				runner.skipUpdateNow = false;
+			}
+		}
+
+		int frameTime = getTimeStamp() - frameStartTime;
+#define FRAME_TIME 20 //16
+		// debug_printf("frameTime = %d\n", frameTime);
+		if (frameTime < FRAME_TIME) { // 1000ms/60frames = 16.(6)
+			// printf("frameTime = %d\n", frameTime);
+			graphicsDelay(FRAME_TIME - frameTime);
+		}
+	}
+
+	graphicsDestroy();
+
+	return 0;
+}
diff --git a/misc.c b/misc.c
new file mode 100644
index 0000000..e99ce03
--- /dev/null
+++ b/misc.c
@@ -0,0 +1,27 @@
+#include "misc.h"
+#pragma warning(disable:4996)
+
+int getRandomNumber(int _min, int _max) {
+	return rand() % (_max - _min + 1) + _min;
+}
+
+void intToStr(int num, int ndigits, char* result) {
+	char num_str[16]; // 16 more than enough for int
+	sprintf(num_str, "%d", num); // Convert num to a string
+	if (strlen(num_str) > ndigits) {
+		// Copy only the last ndigits to result
+		strcpy(result, num_str + strlen(num_str) - ndigits);
+	}
+	else {
+		// Pad the string with leading zeros until it reaches a length of ndigits
+		size_t z = ndigits - strlen(num_str);
+		for (size_t i = 0; i < z; i++) {
+			result[i] = '0';
+		}
+		strcpy(result + z, num_str);
+	}
+}
+
+int getTimeStamp() {
+	return _ksys_get_ns_count()/1000000;
+}
diff --git a/misc.h b/misc.h
new file mode 100644
index 0000000..4c8810e
--- /dev/null
+++ b/misc.h
@@ -0,0 +1,13 @@
+#ifndef MISC_H
+#define MISC_H
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ksys.h>
+
+int getRandomNumber(int _min, int _max);
+void intToStr(int num, int ndigits, char* result);
+int getTimeStamp();
+
+#endif
diff --git a/obstacle.c b/obstacle.c
new file mode 100644
index 0000000..94a6d6f
--- /dev/null
+++ b/obstacle.c
@@ -0,0 +1,153 @@
+#include "obstacle.h"
+
+ObstacleTypeConfig obstacleTypeConfigs[3] = {
+		{
+			.type = CACTUS_SMALL,
+			.width = 17,
+			.height = 35,
+			.yPos = 105,
+			.multipleSpeed = 4,
+			.minGap = 120,
+			.minSpeed = 0,
+			.collisionBoxesCount = 3,
+			.collisionBoxes = {
+				{.x = 0, .y = 7, .width = 5, .height = 27},
+				{.x = 4, .y = 0, .width = 6, .height = 34},
+				{.x = 10, .y = 4, .width = 7, .height = 14}
+			},
+			.numFrames = 1,
+			.speedOffset = 0
+		},
+		{
+			.type = CACTUS_LARGE,
+			.width = 25,
+			.height = 50,
+			.yPos = 90,
+			.multipleSpeed = 7,
+			.minGap = 120,
+			.minSpeed = 0,
+			.collisionBoxesCount = 3,
+			.collisionBoxes = {
+				{.x = 0, .y = 12, .width = 7, .height = 38},
+				{.x = 8, .y = 0, .width = 7, .height = 49},
+				{.x = 13, .y = 10, .width = 10, .height = 38}
+			},
+			.numFrames = 1,
+			.speedOffset = 0
+		},
+		{
+			.type = PTERODACTYL,
+			.width = 46,
+			.height = 40,
+			.yPos = -1,
+			.yPosArrSize = 3,
+			.yPosArr = {100, 75, 50},
+			.multipleSpeed = 999,
+			.minGap = 150,
+			.minSpeed = 8.5,
+			.collisionBoxesCount = 5,
+			.collisionBoxes = {
+				{.x = 15, .y = 15, .width = 16, .height = 5},
+				{.x = 18, .y = 21, .width = 24, .height = 6},
+				{.x = 2, .y = 14, .width = 4, .height = 3},
+				{.x = 6, .y = 10, .width = 4, .height = 7},
+				{.x = 10, .y = 8, .width = 6, .height = 9}
+			},
+			.numFrames = 2,
+			.frameRate = 1000 / 6,
+			.speedOffset = 0.8
+		}
+};
+
+int obstacleSpritePosX[3] = { ATLAS_CACTUS_SMALL_X, ATLAS_CACTUS_LARGE_X, ATLAS_PTERODACTYL_X};
+int obstacleSpritePosY[3] = { ATLAS_CACTUS_SMALL_Y, ATLAS_CACTUS_LARGE_Y, ATLAS_PTERODACTYL_Y};
+
+
+void obstacleInit(Obstacle* ob, ObstacleTypeConfig *otc, int dim_width, double gapCoefficient, double speed, int opt_xOffset) {
+	ob->typeConfig = *otc;
+	ob->gapCoefficient = gapCoefficient;
+	ob->size = getRandomNumber(1, OBSTACLE_MAX_OBSTACLE_LENGTH);
+	ob->remove = false;
+	ob->xPos = dim_width + opt_xOffset;
+	ob->yPos = 0;
+
+	// For animated obstacles
+	ob->currentFrame = 0;
+	ob->timer = 0;
+
+	ob->followingObstacleCreated = false;
+
+	if (ob->size > 1 && ob->typeConfig.multipleSpeed > speed) { // NOTE what it this?
+		ob->size = 1;
+	}
+	ob->width = ob->typeConfig.width * ob->size;
+
+	if (ob->typeConfig.yPos == -1) {
+		ob->yPos = ob->typeConfig.yPosArr[getRandomNumber(0, ob->typeConfig.yPosArrSize)];
+	}
+	else {
+		ob->yPos = ob->typeConfig.yPos;
+	}
+
+	obstacleDraw(ob);
+
+	// Make collision box adjustments,
+	// Central box is adjusted to the size as one box.
+	//      ____        ______        ________
+	//    _|   |-|    _|     |-|    _|       |-|
+	//   | |<->| |   | |<--->| |   | |<----->| |
+	//   | | 1 | |   | |  2  | |   | |   3   | |
+	//   |_|___|_|   |_|_____|_|   |_|_______|_|
+	//
+
+	if (ob->size > 1) {
+		ob->typeConfig.collisionBoxes[1].width = ob->width - ob->typeConfig.collisionBoxes[0].width - ob->typeConfig.collisionBoxes[2].width;
+		ob->typeConfig.collisionBoxes[2].x = ob->width - ob->typeConfig.collisionBoxes[2].width;
+	}
+
+	// For obstacles that go at a different speed from the horizon
+	if (ob->typeConfig.speedOffset) {
+		ob->typeConfig.speedOffset = (double)rand() / RAND_MAX > 0.5 ? ob->typeConfig.speedOffset : -ob->typeConfig.speedOffset;
+	}
+	ob->gap = obstacleGetGap(ob, ob->gapCoefficient, speed);
+}
+
+void obstacleDraw(const Obstacle *ob) {
+	int sourceWidth = ob->typeConfig.width;
+	int sourceHeight = ob->typeConfig.height;
+	int sourceX = (sourceWidth * ob->size) * (0.5 * ((double)ob->size - 1)) + obstacleSpritePosX[ob->typeConfig.type];
+	if (ob->currentFrame > 0) {
+		sourceX += sourceWidth*ob->currentFrame;
+	}
+	graphicsBlitAtlasImage(sourceX, obstacleSpritePosY[ob->typeConfig.type], ob->xPos, ob->yPos, sourceWidth*ob->size, sourceHeight, false);
+}
+
+void obstacleUpdate(Obstacle *ob, int deltaTime, double speed) {
+	if (!ob->remove) {
+		ob->xPos -= floor(((speed + ob->typeConfig.speedOffset)*FPS/1000.)*deltaTime);
+	}
+	// Update frames
+	if (ob->typeConfig.numFrames > 1) {
+		ob->timer += deltaTime;
+		if (ob->timer >= ob->typeConfig.frameRate) {
+			ob->currentFrame = ob->currentFrame == ob->typeConfig.numFrames - 1 ? 0 : ob->currentFrame + 1;
+			ob->timer = 0;
+		}
+	}
+	obstacleDraw(ob);
+	if (!obstacleIsVisible(ob)) {
+		ob->remove = true;
+	}
+}
+
+int obstacleGetGap(const Obstacle *ob, double gapCoefficient, double speed) {
+	int minGap = round(ob->width * speed + ob->typeConfig.minGap * gapCoefficient);
+	int maxGap = round(minGap * OBSTACLE_MAX_GAP_COEFFICIENT);
+	return getRandomNumber(minGap, maxGap);
+}
+
+bool obstacleIsVisible(const Obstacle* ob) {
+	return ob->xPos + ob->width > 0;
+}
+
+
diff --git a/obstacle.h b/obstacle.h
new file mode 100644
index 0000000..a108109
--- /dev/null
+++ b/obstacle.h
@@ -0,0 +1,67 @@
+#ifndef OBSTACLE_H
+#define OBSTACLE_H
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <math.h>
+#include "graphics.h"
+#include "misc.h"
+#include "config.h"
+#include "collisionbox.h"
+
+// Coefficient for calculating the maximum gap
+#define OBSTACLE_MAX_GAP_COEFFICIENT 1.5
+
+// Maximum obstacle grouping count
+#define OBSTACLE_MAX_OBSTACLE_LENGTH 3
+
+typedef enum {
+    CACTUS_SMALL = 0,
+    CACTUS_LARGE = 1,
+    PTERODACTYL = 2
+} ObstacleType;
+
+extern int obstacleSpritePosX[3];
+extern int obstacleSpritePosY[3];
+
+typedef struct {
+    ObstacleType type;
+    int width;
+    int height;
+    int yPos;
+    int yPosArrSize;
+    int yPosArr[3]; // used if yPos is -1
+    int multipleSpeed;
+    int minGap;
+    int minSpeed;
+    int collisionBoxesCount;
+    CollisionBox collisionBoxes[5];
+    int numFrames;
+    double frameRate;
+    double speedOffset;
+} ObstacleTypeConfig;
+
+typedef struct {
+    ObstacleTypeConfig typeConfig;
+    double gapCoefficient;
+    int size;
+    bool remove;
+    int xPos;
+    int yPos;
+    int width;
+    int gap;
+    // double speedOffset;
+    int currentFrame;
+    int timer;
+    bool followingObstacleCreated;
+} Obstacle;
+
+extern ObstacleTypeConfig obstacleTypeConfigs[3];
+
+void obstacleInit(Obstacle *ob, ObstacleTypeConfig *otc, int dim_width, double gapCoefficient, double speed, int opt_xOffset);
+void obstacleDraw(const Obstacle* ob);
+void obstacleUpdate(Obstacle* ob, int deltaTime, double speed);
+int obstacleGetGap(const Obstacle* ob, double gapCoefficient, double speed);
+bool obstacleIsVisible(const Obstacle* ob);
+
+#endif
diff --git a/run.bat b/run.bat
new file mode 100644
index 0000000..2e8bdee
--- /dev/null
+++ b/run.bat
@@ -0,0 +1 @@
+qemu-system-i386 -fda kolibri.img -boot a -m 512 -usbdevice tablet -drive file=fat:rw:.
\ No newline at end of file
diff --git a/runner.c b/runner.c
new file mode 100644
index 0000000..16ad003
--- /dev/null
+++ b/runner.c
@@ -0,0 +1,317 @@
+#include "runner.h"
+
+Runner runner;
+
+void runnerInit() {
+	runner.distanceRan = 0;
+	runner.highestScore = 0;
+	runner.time = 0;
+	runner.msPerFrame = 1000 / FPS;
+	runner.currentSpeed = RUNNER_SPEED;
+	runner.activated = false;
+	runner.playing = false;
+	runner.crashed = false;
+	runner.paused = false;
+	runner.inverted = false;
+	runner.playingIntro = false;
+	runner.isRunning = false; // is running or game stopped
+	runner.invertTimer = 0;
+	runner.playCount = 0;
+	runner.nextUpdateScheduled = false;
+	runner.skipUpdateNow = false;
+	// TODO sound
+	// runnerLoadImages();
+	runnerAdjustDimensions();
+	// setSpeed
+	graphicsFillBackground(0xF7, 0xF7, 0xF7);
+
+	gameOverPanelInit(runner.width, runner.height);
+	
+	horizonInit(runner.width, RUNNER_GAP_COEFFICIENT);
+	distanceMeterInit(runner.width);
+	trexInit();
+
+	// this.startListening();
+	runnerUpdate();
+	//window.addEventListener(Runner.events.RESIZE, this.debounceResize.bind(this));
+}
+
+void runnerAdjustDimensions() {
+	runner.width = DEFAULT_WIDTH;
+	runner.height = RUNNER_DEFAULT_HEIGHT;
+	// distance meter ...
+}
+
+void runnerOnKeyDown(int key) {
+	if (!runner.crashed && (key == RUNNER_KEYCODE_JUMP_1 || key == RUNNER_KEYCODE_JUMP_2)) {
+		if (!runner.playing) {
+			// this.loadSounds(); // TODO
+			runner.playing = true;
+			//printf("first jump! %u\n", getTimeStamp());
+			runnerUpdate();
+			runner.nextUpdateScheduled = false;
+			runner.skipUpdateNow = true;
+		}
+		//  Play sound effect and jump on starting the game for the first time.
+		if (!trex.jumping && !trex.ducking) {
+			// this.playSound(this.soundFx.BUTTON_PRESS); // TODO
+			trexStartJump(runner.currentSpeed);
+		}
+	}
+	if (runner.playing && !runner.crashed && key == RUNNER_KEYCODE_DUCK) {
+		if (trex.jumping) {
+			// Speed drop, activated only when jump key is not pressed.
+			trexSetSpeedDrop();
+		}
+		else if (!trex.jumping && !trex.ducking) {
+			// Duck
+			trexSetDuck(true);
+		}
+	}
+}
+
+void runnerOnKeyUp(int key) {
+	if (runner.isRunning && (key == RUNNER_KEYCODE_JUMP_1 || key == RUNNER_KEYCODE_JUMP_2)) {
+		trexEndJump();
+	}
+	else if (key == RUNNER_KEYCODE_DUCK) {
+		trex.speedDrop = false;
+		trexSetDuck(false);
+	}
+	else if (runner.crashed) {
+		// Check that enough time has elapsed before allowing jump key to restart.
+		int deltaTime = getTimeStamp() - runner.time;
+		//printf(".deltaTime = %d\n", deltaTime);
+		if (key == RUNNER_KEYCODE_RESTART || (deltaTime >= RUNNER_GAMEOVER_CLEAR_TIME && (key == RUNNER_KEYCODE_JUMP_1 || key == RUNNER_KEYCODE_JUMP_2))) {
+			runnerRestart();
+		}
+	}
+	else if (runner.paused && (key == RUNNER_KEYCODE_JUMP_1 || key == RUNNER_KEYCODE_JUMP_2)) {
+		trexReset();
+		runnerPlay();
+	}
+}
+
+void runnerClearCanvas() {
+	graphicsFillBackground(0xF7, 0xF7, 0xF7);
+	//graphicsRender();
+}
+
+void runnerUpdate() {
+	//printf("runnerUpdate() runner.playing = %d\n", runner.playing);
+	//runner.updatePending = false;
+	int now = getTimeStamp();
+	//printf("now = %d\n", now);
+	int deltaTime = now - (runner.time ? runner.time : 0);
+	//printf("runnerUpdate() deltaTime = %d\n", deltaTime);
+	runner.time = now;
+	if (runner.playing) {
+		//printf("runnerUpdate() %d\n", getTimeStamp());
+		runnerClearCanvas();
+
+		if (trex.jumping) {
+			trexUpdateJump(deltaTime);
+		}
+
+		runner.runningTime += deltaTime;
+		bool hasObstacles = runner.runningTime > RUNNER_CLEAR_TIME;
+
+		// First jump triggers the intro.
+		if (trex.jumpCount == 1 && !runner.playingIntro) {
+			//printf("trex.jumpCount = %d\n", trex.jumpCount);
+			runnerPlayIntro();
+		}
+
+		// The horizon doesn't move until the intro is over.
+		if (runner.playingIntro) {
+			horizonUpdate(0, runner.currentSpeed, hasObstacles, false);
+		}
+		else {
+			deltaTime = !runner.activated ? 0 : deltaTime;
+			horizonUpdate(deltaTime, runner.currentSpeed, hasObstacles, runner.inverted);
+		}
+
+		// Check for collisions.
+		bool collision = hasObstacles && runnerCheckForCollision(horizon.obstacles->head->data);
+
+		if (!collision) {
+			runner.distanceRan += runner.currentSpeed * deltaTime / runner.msPerFrame;
+
+			if (runner.currentSpeed < RUNNER_MAX_SPEED) {
+				runner.currentSpeed += RUNNER_ACCELERATION;
+			}
+		}
+		else {
+			runnerGameOver();
+		}
+
+		bool playAchievementSound = distanceMeterUpdate(deltaTime, (int)ceil(runner.distanceRan));
+
+		if (playAchievementSound) {
+			//this.playSound(this.soundFx.SCORE); // TODO
+		}
+
+		/*// Night mode.
+		if (this.invertTimer > this.config.INVERT_FADE_DURATION) {
+			this.invertTimer = 0;
+			this.invertTrigger = false;
+			this.invert();
+		}
+		else if (this.invertTimer) {
+			this.invertTimer += deltaTime;
+		}
+		else {
+			var actualDistance =
+				this.distanceMeter.getActualDistance(Math.ceil(this.distanceRan));
+
+			if (actualDistance > 0) {
+				this.invertTrigger = !(actualDistance %
+					this.config.INVERT_DISTANCE);
+
+				if (this.invertTrigger&& this.invertTimer == = 0) {
+					this.invertTimer += deltaTime;
+					this.invert();
+				}
+			}
+		}*/
+	}
+
+	runner.nextUpdateScheduled = false;//
+	if (runner.playing || (!runner.activated && trex.blinkCount < RUNNER_MAX_BLINK_COUNT)) {
+		trexUpdate(deltaTime, -1);
+		runner.nextUpdateScheduled = true;
+	}
+	
+	graphicsRender(); // blit all drawn to the screen
+	//printf("runner update end\n\n");
+}
+
+void runnerGameOver() {
+	// this.playSound(this.soundFx.HIT); // TODO
+	runnerStop();
+	runner.crashed = true;
+	distanceMeter.achievement = false;
+	trexUpdate(100, TREX_STATUS_CRASHED);
+
+	// Game over panel
+	gameOverPanelDraw();
+	// Update the high score
+	if (runner.distanceRan > runner.highestScore) {
+		runner.highestScore = (int)ceil(runner.distanceRan);
+		distanceMeterSetHighScore(runner.highestScore);
+	}
+	// Reset the time clock
+	runner.time = getTimeStamp();
+}
+
+void runnerStop() {
+	runner.playing = false;
+	runner.paused = true;
+	runner.isRunning = false;
+}
+
+void runnerPlay() {
+	if (!runner.crashed) {
+		runner.playing = true;
+		runner.paused = false;
+		trexUpdate(0, TREX_STATUS_RUNNING);
+		runner.time = getTimeStamp();
+		runnerUpdate();
+	}
+}
+
+void runnerRestart() {
+	if (!runner.isRunning) {
+		runner.playCount++;
+		runner.runningTime = 0;
+		runner.playing = true;
+		runner.crashed = false;
+		runner.distanceRan = 0;
+		runner.currentSpeed = RUNNER_SPEED;
+		runner.time = getTimeStamp();
+		runnerClearCanvas();
+		distanceMeterReset(runner.highestScore);
+		horizonReset();
+		trexReset();
+		//this.playSound(this.soundFx.BUTTON_PRESS);
+		//this.invert(true);
+		runner.isRunning = true;
+		runnerUpdate();
+	}
+}
+
+void runnerPlayIntro() {
+	//printf("runnerPlayIntro()\n");
+	if (!runner.activated && !runner.crashed) {
+		runner.playingIntro = true;
+		trex.playingIntro = true;
+		runner.playing = true;
+		runner.activated = true;
+	}
+	else if (runner.crashed) {
+		runnerRestart();
+	}
+}
+
+void runnerStartGame() {
+	runner.runningTime = 0;
+	runner.playingIntro = false;
+	trex.playingIntro = false;
+	runner.playCount++;
+	runner.isRunning = true;
+}
+
+CollisionBox createAdjustedCollisionBox(CollisionBox box, CollisionBox adjustment) {
+	return (CollisionBox){ .x = box.x + adjustment.x, .y = box.y + adjustment.y, .width = box.width, .height = box.height };
+}
+
+// Returns whether boxes intersected
+bool boxCompare(CollisionBox tRexBox, CollisionBox obstacleBox) {
+	// Axis-Aligned Bounding Box method.
+	return (tRexBox.x < obstacleBox.x + obstacleBox.width &&
+		tRexBox.x + tRexBox.width > obstacleBox.x &&
+		tRexBox.y < obstacleBox.y + obstacleBox.height &&
+		tRexBox.height + tRexBox.y > obstacleBox.y);
+}
+
+bool runnerCheckForCollision(const Obstacle* obstacle) {
+	// Adjustments are made to the bounding box as there is a 1 pixel white
+		// border around the t-rex and obstacles.
+	CollisionBox tRexBox = {
+		.x = trex.xPos + 1,
+		.y = trex.yPos + 1,
+		.width = TREX_WIDTH - 2,
+		.height = TREX_HEIGHT - 2 };
+
+	CollisionBox obstacleBox = {
+		.x = obstacle->xPos + 1,
+		.y = obstacle->yPos + 1,
+		.width = obstacle->typeConfig.width * obstacle->size - 2,
+		.height = obstacle->typeConfig.height - 2 };
+
+	// Simple outer bounds check.
+	if (boxCompare(tRexBox, obstacleBox)) {
+		CollisionBox* tRexCollisionBoxes = &trexDuckingCollisionBox;
+		int tRexCollisionBoxesCount = 1;
+		if (!trex.ducking) {
+			tRexCollisionBoxes = trexRunningCollisionBox;
+			tRexCollisionBoxesCount = 6;
+		}
+
+		// Detailed axis aligned box check.
+		for (int t = 0; t < tRexCollisionBoxesCount; t++) {
+			for (int i = 0; i < obstacle->typeConfig.collisionBoxesCount; i++) {
+				// Adjust the box to actual positions.
+				CollisionBox adjTrexBox = createAdjustedCollisionBox(tRexCollisionBoxes[t], tRexBox);
+				CollisionBox adjObstacleBox = createAdjustedCollisionBox(obstacle->typeConfig.collisionBoxes[i], obstacleBox);
+				
+				if (boxCompare(adjTrexBox, adjObstacleBox)) {
+					return true;// [adjTrexBox, adjObstacleBox] ;
+				}
+			}
+		}
+	}
+	return false;
+}
+
+
diff --git a/runner.h b/runner.h
new file mode 100644
index 0000000..35bea13
--- /dev/null
+++ b/runner.h
@@ -0,0 +1,89 @@
+#ifndef RUNNER_H
+#define RUNNER_H
+
+#include <stdbool.h>
+#include "config.h"
+#include "ulist.h"
+#include "graphics.h"
+#include "horizon.h"
+#include "distance_meter.h"
+#include "game_over_panel.h"
+#include "trex.h"
+
+#define RUNNER_DEFAULT_HEIGHT 150
+
+#define RUNNER_ACCELERATION 0.001
+#define RUNNER_BG_CLOUD_SPEED 0.2
+#define RUNNER_BOTTOM_PAD 10
+#define RUNNER_CLEAR_TIME 3000
+#define RUNNER_CLOUD_FREQUENCY 0.5
+#define RUNNER_GAMEOVER_CLEAR_TIME 750
+#define RUNNER_GAP_COEFFICIENT 0.6
+#define RUNNER_GRAVITY 0.6
+#define RUNNER_INITIAL_JUMP_VELOCITY 12
+#define RUNNER_INVERT_FADE_DURATION 12000
+#define RUNNER_INVERT_DISTANCE 700
+#define RUNNER_MAX_BLINK_COUNT 3
+#define RUNNER_MAX_CLOUDS 6
+#define RUNNER_MAX_OBSTACLE_LENGTH 3
+#define RUNNER_MAX_OBSTACLE_DUPLICATION 2
+#define RUNNER_MAX_SPEED 13
+#define RUNNER_MIN_JUMP_HEIGHT 35
+#define RUNNER_MOBILE_SPEED_COEFFICIENT 1.2
+#define RUNNER_SPEED 6
+#define RUNNER_SPEED_DROP_COEFFICIENT 3
+
+#define RUNNER_KEYCODE_JUMP_1 82
+#define RUNNER_KEYCODE_JUMP_2 32
+#define RUNNER_KEYCODE_DUCK 81
+#define RUNNER_KEYCODE_RESTART 13
+
+typedef struct {
+	int width;
+	int height;
+	double distanceRan;
+	int highestScore;
+	int time;
+	int runningTime;
+	double msPerFrame;
+	double currentSpeed;
+	// Ulist* obstacles;
+	bool activated;
+	bool playing;
+	bool crashed;
+	bool paused;
+	bool inverted;
+	bool invertTimer;
+	bool playingIntro;
+	bool isRunning;
+	// resizeTimerId_
+	int playCount;
+	// soundFx
+	// audioContext
+	// images
+	// imagesLoaded
+	bool nextUpdateScheduled;
+	bool skipUpdateNow;
+} Runner;
+
+extern Runner runner;
+
+void runnerInit();
+void runnerAdjustDimensions();
+//void runnerLoadImages();
+
+void runnerClearCanvas();
+
+void runnerPlayIntro();
+void runnerStartGame();
+void runnerUpdate();
+void runnerOnKeyDown(int key);
+void runnerOnKeyUp(int key);
+void runnerGameOver();
+void runnerStop();
+void runnerPlay();
+void runnerRestart();
+
+bool runnerCheckForCollision(const Obstacle *obstacle);
+
+#endif
diff --git a/sprites.h b/sprites.h
new file mode 100644
index 0000000..dc3fe33
--- /dev/null
+++ b/sprites.h
@@ -0,0 +1,169 @@
+// Original chrome dino sprite pack
+static const char sprites100[] = {
+  0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52,
+  0x00, 0x00, 0x04, 0xd1, 0x00, 0x00, 0x00, 0x44, 0x08, 0x00, 0x00, 0x00, 0x00, 0x8a, 0x23, 0xfc,
+  0x41, 0x00, 0x00, 0x00, 0x02, 0x74, 0x52, 0x4e, 0x53, 0x00, 0x00, 0x76, 0x93, 0xcd, 0x38, 0x00,
+  0x00, 0x0a, 0x0e, 0x49, 0x44, 0x41, 0x54, 0x78, 0x01, 0xec, 0x9d, 0x5b, 0x76, 0xa4, 0xb8, 0x16,
+  0x44, 0x83, 0xbb, 0xb8, 0x0f, 0x4d, 0x84, 0xa1, 0xd8, 0x03, 0x80, 0x4f, 0x0d, 0x4f, 0x9f, 0xa9,
+  0x01, 0x54, 0x0d, 0x85, 0x89, 0xe8, 0x93, 0xae, 0x57, 0xac, 0xab, 0xaa, 0x68, 0xf2, 0x58, 0x2d,
+  0xd2, 0x98, 0xf4, 0xd9, 0xbd, 0x3a, 0x13, 0x9f, 0x07, 0x95, 0x18, 0x57, 0x38, 0x24, 0x01, 0x05,
+  0xc7, 0x71, 0x1c, 0xc7, 0x71, 0x1c, 0xe7, 0xc3, 0x31, 0xe0, 0x3b, 0x05, 0xf7, 0x08, 0x38, 0x8e,
+  0x15, 0xc0, 0x84, 0x83, 0x29, 0x08, 0x6f, 0x2b, 0x43, 0xb8, 0x1f, 0xd8, 0x80, 0xa1, 0xb7, 0x85,
+  0x65, 0x2c, 0x7c, 0x58, 0x82, 0xb4, 0x76, 0xac, 0xf8, 0xce, 0xd4, 0x11, 0x83, 0x55, 0xdd, 0x10,
+  0x23, 0x5f, 0x5f, 0xf0, 0x93, 0x19, 0x40, 0xe6, 0x36, 0x32, 0x43, 0x3f, 0xa3, 0x33, 0xb8, 0xc9,
+  0xca, 0x2a, 0xc4, 0x34, 0x63, 0xe0, 0x26, 0xcb, 0x19, 0xe2, 0xae, 0xea, 0xe6, 0xc7, 0x52, 0xa0,
+  0x84, 0x0b, 0xd6, 0x5e, 0x80, 0x11, 0x00, 0x4a, 0xc4, 0x3d, 0x4a, 0x40, 0x07, 0xf2, 0xb3, 0xbc,
+  0xae, 0x98, 0x70, 0x02, 0x25, 0xf2, 0x50, 0xf6, 0x02, 0xdb, 0x02, 0x6c, 0x43, 0x4f, 0x4b, 0x55,
+  0xc6, 0xc2, 0xa3, 0x13, 0x4a, 0x7b, 0xc7, 0x84, 0xd3, 0x98, 0x80, 0x15, 0x77, 0x98, 0xa9, 0x64,
+  0x94, 0xa0, 0xea, 0x3d, 0x4b, 0x21, 0x31, 0x42, 0x33, 0xb2, 0xec, 0xe5, 0x39, 0x71, 0x46, 0x5b,
+  0xd0, 0x10, 0x4b, 0x40, 0xbf, 0x96, 0xff, 0xd0, 0x31, 0x6a, 0xda, 0x84, 0xe3, 0x28, 0x88, 0xa6,
+  0x4b, 0xe3, 0x51, 0xf2, 0x50, 0x24, 0x40, 0x75, 0xc2, 0xb2, 0x0d, 0x1d, 0x2d, 0x55, 0x19, 0x0b,
+  0x0f, 0x4f, 0xa8, 0x57, 0xb4, 0x3b, 0xc8, 0xba, 0x1f, 0x9b, 0xac, 0x3a, 0xac, 0xa6, 0xdd, 0xae,
+  0x63, 0x54, 0x2f, 0xa3, 0x4e, 0xc9, 0xaa, 0x4c, 0xb4, 0x67, 0x14, 0xba, 0x2c, 0x59, 0xd9, 0x64,
+  0x87, 0x6e, 0xc9, 0x7e, 0x33, 0xde, 0xc1, 0xa1, 0x45, 0xfc, 0x4e, 0xba, 0x72, 0xad, 0xf1, 0x9b,
+  0x24, 0x9f, 0xac, 0x68, 0x14, 0x34, 0x5b, 0xd2, 0x3a, 0x8e, 0x7c, 0x45, 0xfd, 0x93, 0xbe, 0xe2,
+  0x7a, 0xa8, 0xeb, 0xa1, 0x90, 0x9d, 0xea, 0x37, 0xdb, 0x99, 0x1e, 0x52, 0x3b, 0x61, 0xed, 0xb1,
+  0x69, 0x5f, 0x7f, 0x0c, 0x3b, 0xa9, 0x5b, 0x33, 0xe6, 0x4c, 0x69, 0xe3, 0x98, 0x11, 0x32, 0x12,
+  0xcd, 0x8c, 0xcd, 0xf5, 0x68, 0xb2, 0xee, 0xc8, 0x6e, 0xca, 0x3e, 0x1d, 0x23, 0xde, 0x89, 0x49,
+  0x05, 0xee, 0x38, 0xc4, 0xa5, 0x59, 0xca, 0xa4, 0x81, 0x0d, 0x83, 0x4a, 0x55, 0x5d, 0x51, 0x22,
+  0x1b, 0x59, 0xb5, 0x6c, 0xda, 0xf2, 0x78, 0xd4, 0x2b, 0xda, 0x74, 0x3b, 0x34, 0x8d, 0x31, 0x3a,
+  0xdd, 0x8f, 0x4d, 0x58, 0xed, 0xba, 0xaf, 0x7c, 0x7d, 0x31, 0x4d, 0xc0, 0xcc, 0x31, 0xa4, 0xd6,
+  0x64, 0x16, 0x66, 0xed, 0x81, 0x86, 0xde, 0x95, 0x68, 0xfc, 0xc4, 0x5e, 0xb9, 0x76, 0xd6, 0x08,
+  0xf2, 0x65, 0x15, 0xcd, 0x3e, 0x72, 0x85, 0x23, 0xcf, 0x93, 0x26, 0x74, 0x4a, 0x2c, 0x41, 0x03,
+  0xdb, 0x82, 0x4d, 0xa5, 0xaa, 0xaa, 0x28, 0x11, 0xb1, 0xfc, 0x2e, 0x68, 0x58, 0xb4, 0xa5, 0x05,
+  0x1d, 0x3e, 0x3e, 0x9e, 0x09, 0xe7, 0x23, 0x36, 0xed, 0x85, 0x72, 0x76, 0x9f, 0x2c, 0x5f, 0x8a,
+  0x7e, 0x49, 0x41, 0x9e, 0xeb, 0xad, 0x53, 0xb9, 0x61, 0x39, 0x63, 0xbf, 0x1d, 0xb5, 0xc0, 0xd2,
+  0x5f, 0x7b, 0xbe, 0xa2, 0xa5, 0x88, 0x36, 0x32, 0xe6, 0x46, 0x6f, 0xb0, 0x4e, 0xc0, 0x54, 0x25,
+  0x6a, 0x4a, 0xd3, 0xaa, 0x4a, 0x69, 0x76, 0x69, 0x25, 0xd6, 0xe6, 0x86, 0x81, 0xff, 0x2d, 0xc0,
+  0x72, 0xab, 0xa4, 0x6a, 0xf8, 0xb3, 0x02, 0xfb, 0xb0, 0xe5, 0xf8, 0xe1, 0x63, 0xbf, 0x38, 0xf6,
+  0x39, 0xb4, 0x49, 0x63, 0xfb, 0x4e, 0x6b, 0x5a, 0xff, 0xb9, 0x4b, 0xc3, 0xcb, 0xd7, 0x7d, 0x41,
+  0xa3, 0xf3, 0xe2, 0xeb, 0x4c, 0x3f, 0xa6, 0x43, 0xca, 0xcc, 0x6c, 0x3d, 0xe4, 0x9c, 0x7f, 0x7c,
+  0xa5, 0xcb, 0xa6, 0xce, 0x7d, 0x16, 0xdc, 0x7a, 0x6b, 0x4f, 0x60, 0x44, 0xaf, 0xa4, 0x09, 0xf6,
+  0xd0, 0x64, 0x92, 0xd1, 0xe7, 0xd5, 0x28, 0xe1, 0x9c, 0xe1, 0xa3, 0x50, 0x82, 0x88, 0xe3, 0xd5,
+  0x99, 0xf3, 0xbd, 0x31, 0x27, 0x93, 0x1a, 0xb3, 0x39, 0x57, 0xc6, 0x96, 0x53, 0xf7, 0xcb, 0xda,
+  0xa7, 0x67, 0x44, 0xb7, 0xa4, 0xcd, 0xa6, 0x2b, 0x98, 0xcc, 0xc1, 0x07, 0x29, 0x88, 0xc6, 0xf5,
+  0x65, 0x5a, 0x9d, 0x90, 0x10, 0x0d, 0x97, 0x56, 0x82, 0x15, 0xb0, 0x5b, 0x74, 0xe4, 0x7a, 0x3e,
+  0xfc, 0x20, 0xb6, 0x38, 0xae, 0xf6, 0xf9, 0x31, 0xeb, 0x48, 0xeb, 0x5c, 0xda, 0x6a, 0xd7, 0x91,
+  0x3c, 0xcb, 0x08, 0x73, 0xff, 0x6b, 0x5b, 0xcc, 0x64, 0x10, 0xc1, 0x0e, 0x1b, 0xe7, 0xd6, 0x5f,
+  0x7b, 0xb6, 0xa2, 0xa5, 0x5a, 0xd2, 0x12, 0x10, 0x8f, 0xf2, 0x66, 0x46, 0xd5, 0x49, 0x73, 0x67,
+  0x6d, 0x2d, 0x3a, 0x0c, 0x3d, 0x1f, 0x0e, 0xa1, 0xaf, 0x30, 0x8b, 0x66, 0x2c, 0x8e, 0x6e, 0xa0,
+  0xa4, 0x55, 0xab, 0x99, 0x14, 0x2d, 0x0e, 0x3c, 0xbf, 0x27, 0xa9, 0x4a, 0xe4, 0xff, 0x31, 0xcd,
+  0xd6, 0x0a, 0x29, 0x39, 0xf9, 0x33, 0x9e, 0x01, 0xf7, 0x7e, 0xff, 0x12, 0x41, 0xab, 0xb6, 0xd2,
+  0x3b, 0x4c, 0x43, 0x4f, 0x55, 0x51, 0x29, 0xb1, 0x41, 0x44, 0xb5, 0x3a, 0xc6, 0x52, 0x0c, 0x05,
+  0x92, 0xc0, 0xa3, 0x45, 0xab, 0x94, 0xb2, 0x97, 0x30, 0x3a, 0x3e, 0x11, 0x5f, 0xf8, 0xea, 0x38,
+  0xc7, 0x79, 0xb4, 0xa4, 0x4b, 0x98, 0x29, 0x76, 0xf8, 0xb3, 0x95, 0x8b, 0x00, 0x06, 0x93, 0xd6,
+  0x5c, 0x1f, 0x73, 0x72, 0xab, 0xe8, 0x20, 0xd9, 0xe8, 0x90, 0xfa, 0x86, 0xb5, 0x02, 0x59, 0x58,
+  0x66, 0x8c, 0x71, 0x6b, 0xcc, 0xd9, 0x35, 0xee, 0x9c, 0x56, 0x8d, 0xd1, 0xa5, 0xfd, 0x88, 0xbd,
+  0x02, 0xe0, 0x6b, 0x06, 0xa0, 0x1b, 0xba, 0xc9, 0xaf, 0x18, 0xd3, 0x42, 0xc9, 0x6a, 0x5b, 0x86,
+  0xf3, 0xd4, 0xf3, 0x68, 0xf5, 0x68, 0x33, 0x22, 0xf5, 0x0d, 0x38, 0xa7, 0xc6, 0x8b, 0x69, 0x0b,
+  0x62, 0xc3, 0xba, 0x65, 0x5d, 0x9d, 0x00, 0xed, 0x3c, 0x03, 0x4a, 0x88, 0xce, 0xfc, 0x6b, 0x02,
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+  0x89, 0x31, 0x66, 0xd3, 0x7f, 0xd4, 0x72, 0xd5, 0xca, 0x72, 0xf5, 0xba, 0x24, 0x49, 0x92, 0xf4,
+  0x05, 0x52, 0x0d, 0x4e, 0x68, 0xa4, 0x9a, 0xa9, 0x29, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e,
+  0x44, 0xae, 0x42, 0x60, 0x82
+};
\ No newline at end of file
diff --git a/trex.c b/trex.c
new file mode 100644
index 0000000..4fa5275
--- /dev/null
+++ b/trex.c
@@ -0,0 +1,216 @@
+#include "trex.h"
+
+Trex trex;
+
+CollisionBox trexDuckingCollisionBox = {.x = 1, .y = 18, .width = 55, .height = 25};
+CollisionBox trexRunningCollisionBox[6] = 
+{
+	{.x = 22, .y = 0, .width = 17, .height = 16},
+	{.x = 1, .y = 18, .width = 30, .height = 9},
+	{.x = 10, .y = 35, .width = 14, .height = 8},
+	{.x = 1, .y = 24, .width = 29, .height = 5},
+	{.x = 5, .y = 30, .width = 21, .height = 4},
+	{.x = 9, .y = 34, .width = 15, .height = 4}
+};
+
+TrexAnimFramesEntry trexAnimFrames[5] = {
+	{.frameCount = 2, .frames = {44, 0}, .msPerFrame = 1000./3},
+	{.frameCount = 2, .frames = {88, 132}, .msPerFrame = 1000./12},
+	{.frameCount = 1, .frames = {220}, .msPerFrame = 1000./60},
+	{.frameCount = 1, .frames = {0}, .msPerFrame = 1000./60},
+	{.frameCount = 2, .frames = {264, 323}, .msPerFrame = 1000./8}
+};
+
+// T - rex player initaliser
+// Sets the t - rex to blink at random intervals
+void trexInit() {
+	trex.xPos = 0;
+	trex.currentFrame = 0;
+	//this.currentAnimFrames = [];
+	trex.blinkDelay = 0;
+	trex.blinkCount = 0;
+	trex.animStartTime = 0;
+	trex.timer = 0;
+	trex.msPerFrame = 1000. / FPS;
+	trex.status = TREX_STATUS_WAITING;
+
+	trex.jumping = false;
+	trex.ducking = false;
+	trex.jumpVelocity = 0;
+	trex.reachedMinHeight = false;
+	trex.speedDrop = false;
+	trex.jumpCount = 0;
+	trex.jumpspotX = 0;
+
+	trex.groundYPos = RUNNER_DEFAULT_HEIGHT - TREX_HEIGHT - RUNNER_BOTTOM_PAD;
+	trex.yPos = trex.groundYPos;
+	trex.minJumpHeight = trex.groundYPos - TREX_MIN_JUMP_HEIGHT;
+	trex.playingIntro = false;
+
+	trexDraw(0, 0);
+	trexUpdate(0, TREX_STATUS_WAITING);
+}
+
+// Set the animation status
+void trexUpdate(int deltaTime, int opt_status) {
+	//printf("trex.status = %d\n", trex.status);
+	trex.timer += deltaTime;
+	// Update the status
+	if (opt_status != -1) {
+		trex.status = opt_status;
+		trex.currentFrame = 0;
+		trex.msPerFrame = trexAnimFrames[opt_status].msPerFrame;
+		trex.currentAnimFrames = trexAnimFrames[opt_status];
+		if (opt_status == TREX_STATUS_WAITING) {
+			trex.animStartTime = getTimeStamp();
+			trexSetBlinkDelay();
+		}
+	}
+	// Game intro animation, T-rex moves in from the left.
+	if (trex.playingIntro) {
+		if (trex.xPos < TREX_START_X_POS) {
+			//printf("trex.xPos = %d\n", trex.xPos);
+			trex.xPos += max((int)round(((double)TREX_START_X_POS / TREX_INTRO_DURATION) * deltaTime), 1);
+		}
+		else {
+			runnerStartGame();
+		}
+	}
+
+	if (trex.status == TREX_STATUS_WAITING) {
+		trexBlink(getTimeStamp());
+	}
+	else {
+		// printf("trex.status = %d\n", trex.status);
+		trexDraw(trex.currentAnimFrames.frames[trex.currentFrame], 0);
+	}
+
+	// Update the frame position.
+	if (trex.timer >= trex.msPerFrame) {
+		trex.currentFrame = trex.currentFrame == trex.currentAnimFrames.frameCount - 1 ? 0 : trex.currentFrame + 1;
+		trex.timer = 0;
+	}
+
+	// Speed drop becomes duck if the down key is still being pressed.
+	if (trex.speedDrop && trex.yPos == trex.groundYPos) {
+		trex.speedDrop = false;
+		trexSetDuck(true);
+	}
+}
+
+void trexDraw(int x, int y) {
+	//printf("trexDraw();\n");
+	int sourceWidth = trex.ducking && trex.status != TREX_STATUS_CRASHED ? TREX_WIDTH_DUCK : TREX_WIDTH;
+	int sourceHeight = TREX_HEIGHT;
+	// Adjustments for sprite sheet position.
+	int sourceX = x + ATLAS_TREX_X;
+	int sourceY = y + ATLAS_TREX_Y;
+
+	// Ducking.
+	if (trex.ducking && trex.status != TREX_STATUS_CRASHED) {
+		graphicsBlitAtlasImage(sourceX, sourceY, trex.xPos, trex.yPos, sourceWidth, sourceHeight, false);
+	}
+	else {
+		// Crashed whilst ducking. Trex is standing up so needs adjustment.
+		if (trex.ducking && trex.status == TREX_STATUS_CRASHED) {
+			trex.xPos++;
+		}
+		// Standing / running
+		graphicsBlitAtlasImage(sourceX, sourceY, trex.xPos, trex.yPos, sourceWidth, sourceHeight, false);
+	}
+}
+
+void trexSetBlinkDelay() {
+	trex.blinkDelay = (int)ceil(((double)rand()/RAND_MAX)*TREX_BLINK_TIMING);
+}
+
+void trexBlink(int time) {
+	//printf("trexBlink(%d)\n", time);
+	int deltaTime = time - trex.animStartTime;
+	if (deltaTime >= trex.blinkDelay) {
+		trexDraw(trex.currentAnimFrames.frames[trex.currentFrame], 0);
+		if (trex.currentFrame == 1) {
+			// Set new random delay to blink.
+			trexSetBlinkDelay();
+			trex.animStartTime = time;
+			trex.blinkCount++;
+		}
+	}
+}
+
+// Initialise a jump
+void trexStartJump(double speed) {
+	if (!trex.jumping) {
+		trexUpdate(0, TREX_STATUS_JUMPING);
+		// Tweak the jump velocity based on the speed
+		trex.jumpVelocity = TREX_INITIAL_JUMP_VELOCITY - (speed / 10);
+		trex.jumping = true;
+		trex.reachedMinHeight = false;
+		trex.speedDrop = false;
+	}
+}
+
+// Jump is complete, falling down
+void trexEndJump() {
+	if (trex.reachedMinHeight && trex.jumpVelocity < TREX_DROP_VELOCITY) {
+		trex.jumpVelocity = TREX_DROP_VELOCITY;
+	}
+}
+
+// Update frame for a jump
+void trexUpdateJump(int deltaTime) {
+	double msPerFrame = trexAnimFrames[trex.status].msPerFrame;
+	double framesElapsed = deltaTime / msPerFrame;
+
+	// Speed drop makes Trex fall faster.
+	if (trex.speedDrop) {
+		trex.yPos += (int)round(trex.jumpVelocity * TREX_SPEED_DROP_COEFFICIENT * framesElapsed);
+	}
+	else {
+		trex.yPos += (int)round(trex.jumpVelocity * framesElapsed);
+	}
+	trex.jumpVelocity += TREX_GRAVITY * framesElapsed;
+	// Minimum height has been reached.
+	if (trex.yPos < trex.minJumpHeight || trex.speedDrop) {
+		trex.reachedMinHeight = true;
+	}
+	// Reached max height
+	if (trex.yPos < TREX_MAX_JUMP_HEIGHT || trex.speedDrop) {
+		trexEndJump();
+	}
+	// Back down at ground level. Jump completed.
+	if (trex.yPos > trex.groundYPos) {
+		trexReset();
+		trex.jumpCount++;
+	}
+	trexUpdate(deltaTime, -1);
+}
+
+// Set the speed drop.Immediately cancels the current jump
+void trexSetSpeedDrop() {
+	trex.speedDrop = true;
+	trex.jumpVelocity = 1;
+}
+
+void trexSetDuck(bool isDucking) {
+	if (isDucking && trex.status != TREX_STATUS_DUCKING) {
+		trexUpdate(0, TREX_STATUS_DUCKING);
+		trex.ducking = true;
+	}
+	else if (trex.status == TREX_STATUS_DUCKING) {
+		trexUpdate(0, TREX_STATUS_RUNNING);
+		trex.ducking = false;
+	}
+}
+
+// Reset the t-rex to running at start of game
+void trexReset() {
+	trex.yPos = trex.groundYPos;
+	trex.jumpVelocity = 0;
+	trex.jumping = false;
+	trex.ducking = false;
+	trexUpdate(0, TREX_STATUS_RUNNING);
+	//trex.midair = false; TODO: WTF is midair
+	trex.speedDrop = false;
+	trex.jumpCount = 0;
+}
diff --git a/trex.h b/trex.h
new file mode 100644
index 0000000..0b88612
--- /dev/null
+++ b/trex.h
@@ -0,0 +1,83 @@
+#ifndef TREX_H
+#define TREX_H
+
+#include <stdbool.h>
+#include <stdlib.h>
+#include <math.h>
+#include "collisionbox.h"
+#include "runner.h"
+#include "graphics.h"
+#include "misc.h"
+
+// Blinking coefficient
+#define TREX_BLINK_TIMING 7000
+
+#define TREX_DROP_VELOCITY -5
+#define TREX_GRAVITY 0.6
+#define TREX_HEIGHT 47
+#define TREX_HEIGHT_DUCK 25
+#define TREX_INITIAL_JUMP_VELOCITY -10
+#define TREX_INTRO_DURATION 750
+#define TREX_MAX_JUMP_HEIGHT 30
+#define TREX_MIN_JUMP_HEIGHT 30
+#define TREX_SPEED_DROP_COEFFICIENT 3
+#define TREX_SPRITE_WIDTH 262
+#define TREX_START_X_POS 25
+#define TREX_WIDTH 44
+#define TREX_WIDTH_DUCK 59
+
+// Animation states
+typedef enum {
+	TREX_STATUS_WAITING = 0,
+	TREX_STATUS_RUNNING = 1,
+	TREX_STATUS_CRASHED = 2,
+	TREX_STATUS_JUMPING = 3,
+	TREX_STATUS_DUCKING = 4,
+} TrexStatus;
+
+typedef struct {
+	int frameCount;
+	int frames[2];
+	double msPerFrame;
+} TrexAnimFramesEntry;
+
+typedef struct {
+	int xPos;
+	int yPos;
+	int groundYPos;
+	int currentFrame;
+	TrexAnimFramesEntry currentAnimFrames;
+	int blinkDelay;
+	int blinkCount;
+	int animStartTime;
+	int timer;
+	double msPerFrame;
+	TrexStatus status;
+	bool jumping;
+	bool ducking;
+	double jumpVelocity;
+	bool reachedMinHeight;
+	bool speedDrop;
+	int jumpCount;
+	int jumpspotX;
+	int minJumpHeight;
+	bool playingIntro;
+} Trex;
+
+extern CollisionBox trexDuckingCollisionBox;
+extern CollisionBox trexRunningCollisionBox[6];
+extern Trex trex;
+
+void trexInit();
+void trexUpdate(int deltaTime, int opt_status);
+void trexDraw(int x, int y);
+void trexSetBlinkDelay();
+void trexBlink(int time);
+void trexStartJump(double speed);
+void trexEndJump();
+void trexUpdateJump(int deltaTime);
+void trexSetSpeedDrop();
+void trexSetDuck(bool isDucking);
+void trexReset();
+
+#endif
diff --git a/ulist.c b/ulist.c
new file mode 100644
index 0000000..6a57863
--- /dev/null
+++ b/ulist.c
@@ -0,0 +1,241 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include "ulist.h"
+
+Ulist* ulist_create() {
+    Ulist* list = (Ulist*)malloc(sizeof(Ulist));
+    if (list == NULL) {
+        // abort();
+        exit(-1);
+    }
+    list->head = NULL;
+    list->tail = NULL;
+    list->size = 0;
+    return list;
+}
+
+void ulist_destroy(Ulist* list) {
+    Node* current = list->head;
+    Node* next;
+
+    while (current != NULL) {
+        next = current->next;
+        free(current);
+        current = next;
+    }
+
+    free(list);
+}
+
+void ulist_push_front(Ulist* list, void* data) {
+    Node* new_node = (Node*)malloc(sizeof(Node));
+    if (new_node == NULL) {
+        // abort();
+        exit(-1);
+    }
+    new_node->data = data;
+    new_node->prev = NULL;
+    new_node->next = list->head;
+
+    if (list->head != NULL) {
+        list->head->prev = new_node;
+    }
+
+    list->head = new_node;
+
+    if (list->tail == NULL) {
+        list->tail = new_node;
+    }
+
+    list->size++;
+}
+
+void ulist_push_back(Ulist* list, void* data) {
+    Node* new_node = (Node*)malloc(sizeof(Node));
+    if (new_node == NULL) {
+        // abort();
+        exit(-1);
+    }
+    new_node->data = data;
+    new_node->next = NULL;
+    new_node->prev = list->tail;
+
+    if (list->tail != NULL) {
+        list->tail->next = new_node;
+    }
+
+    list->tail = new_node;
+
+    if (list->head == NULL) {
+        list->head = new_node;
+    }
+
+    list->size++;
+}
+
+void ulist_remove(Ulist* list, Node* node) {
+    if (list == NULL || node == NULL) {
+        return;
+    }
+    // Update previous node's next pointer
+    if (node->prev != NULL) {
+        node->prev->next = node->next;
+    }
+    else {
+        // If the node is the head, update the head pointer
+        list->head = node->next;
+    }
+    // Update next node's previous pointer
+    if (node->next != NULL) {
+        node->next->prev = node->prev;
+    }
+    else {
+        // If the node is the tail, update the tail pointer
+        list->tail = node->prev;
+    }
+    // Free the memory occupied by the node
+    free(node);
+    list->size--;
+}
+
+void ulist_remove_front(Ulist* list) {
+    if (list->head == NULL) {
+        return;
+    }
+
+    Node* node_to_remove = list->head;
+    list->head = list->head->next;
+
+    if (list->head != NULL) {
+        list->head->prev = NULL;
+    }
+    else {
+        list->tail = NULL;
+    }
+
+    free(node_to_remove);
+    list->size--;
+}
+
+void ulist_splice(Ulist* list, int n) {
+    if (list->size <= n) {
+        return;  // No need to splice if the list size is less than or equal to n
+    }
+    int count = list->size - n;
+    while (count > 0) {
+        ulist_remove_back(list);
+        count--;
+    }
+}
+
+void ulist_remove_back(Ulist* list) {
+    if (list->tail == NULL) {
+        return;
+    }
+
+    Node* node_to_remove = list->tail;
+    list->tail = list->tail->prev;
+
+    if (list->tail != NULL) {
+        list->tail->next = NULL;
+    }
+    else {
+        list->head = NULL;
+    }
+
+    free(node_to_remove);
+    list->size--;
+}
+
+int ulist_search(Ulist* list, void* data) {
+    Node* current = list->head;
+    int index = 0;
+
+    while (current != NULL) {
+        if (current->data == data) {
+            return index;
+        }
+
+        current = current->next;
+        index++;
+    }
+
+    return -1;
+}
+
+void* ulist_get_front(Ulist* list) {
+    if (list->head == NULL) {
+        return NULL;
+    }
+
+    return list->head->data;
+}
+
+void* ulist_get_back(Ulist* list) {
+    if (list->tail == NULL) {
+        return NULL;
+    }
+
+    return list->tail->data;
+}
+
+int ulist_size(Ulist* list) {
+    return list->size;
+}
+
+void ulist_print(Ulist* list) {
+    Node* current = list->head;
+
+    while (current != NULL) {
+        printf("%p ", current->data);
+        current = current->next;
+    }
+
+    printf("\n");
+}
+
+void ulist_test() {
+    // Create a new Ulist
+    Ulist* list = ulist_create();
+
+    // Test insertFront
+    int data1 = 10;
+    ulist_push_front(list, &data1);
+    printf("List after inserting 10 at the front: ");
+    ulist_print(list); // Expected output: 10
+
+    // Test insertBack
+    int data2 = 20;
+    ulist_push_back(list, &data2);
+    printf("List after inserting 20 at the back: ");
+    ulist_print(list); // Expected output: 10 20
+
+    // Test removeFront
+    ulist_remove_front(list);
+    printf("List after removing front element: ");
+    ulist_print(list); // Expected output: 20
+
+    // Test removeBack
+    ulist_remove_back(list);
+    printf("List after removing back element: ");
+    ulist_print(list); // Expected output: 
+
+    // Test search
+    int data3 = 30;
+    ulist_push_front(list, &data3);
+    printf("Index of 30 in the list: %d\n", ulist_search(list, &data3)); // Expected output: 0
+
+    // Test getFront
+    int* front = (int*)ulist_get_front(list);
+    printf("Front element of the list: %d\n", *front); // Expected output: 30
+
+    // Test getBack
+    int* back = (int*)ulist_get_back(list);
+    printf("Back element of the list: %d\n", *back); // Expected output: 30
+
+    // Test getSize
+    printf("Size of the list: %d\n", ulist_size(list)); // Expected output: 1
+
+    // Destroy the list
+    ulist_destroy(list);
+}
diff --git a/ulist.h b/ulist.h
new file mode 100644
index 0000000..cdb056b
--- /dev/null
+++ b/ulist.h
@@ -0,0 +1,31 @@
+#ifndef ULIST_H_
+#define ULIST_H_
+
+typedef struct Node {
+    void* data;
+    struct Node* prev;
+    struct Node* next;
+} Node;
+
+typedef struct Ulist {
+    Node* head;
+    Node* tail;
+    int size;
+} Ulist;
+
+Ulist* ulist_create();
+void ulist_destroy(Ulist* list);
+void ulist_push_front(Ulist* list, void* data);
+void ulist_push_back(Ulist* list, void* data);
+void ulist_remove(Ulist *list, Node *node);
+void ulist_remove_front(Ulist* list);
+void ulist_splice(Ulist* list, int n);
+void ulist_remove_back(Ulist* list);
+int ulist_search(Ulist* list, void* data);
+void* ulist_get_front(Ulist* list);
+void* ulist_get_back(Ulist* list);
+int ulist_size(Ulist* list);
+void ulist_print(Ulist* list);
+void ulist_test();
+
+#endif /* ULIST_H_ */
\ No newline at end of file