/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* Classes
****/ 
// Cactus obstacle
var Cactus = Container.expand(function () {
	var self = Container.call(this);
	var cactusSprite = self.attachAsset('cactus', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.width = cactusSprite.width;
	self.height = cactusSprite.height;
	self.speed = 0; // Set by game
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
// Dino (player) class
var Dino = Container.expand(function () {
	var self = Container.call(this);
	var dinoSprite = self.attachAsset('dino', {
		anchorX: 0.5,
		anchorY: 1
	});
	self.width = dinoSprite.width;
	self.height = dinoSprite.height;
	// State
	self.isJumping = false;
	self.velocityY = 0;
	self.gravity = 2.2 * 1; // gravity is positive, pulls dino down
	self.jumpStrength = -48; // base jumpStrength (negative: up)
	self.groundY = 0; // Set after adding to game
	// Jump with optional charge parameter
	self.jump = function (chargeFrames) {
		if (!self.isJumping) {
			self.isJumping = true;
			// Allow chargeFrames (0..jumpChargeMax) to scale jumpStrength
			var charge = typeof chargeFrames === "number" ? chargeFrames : 0;
			// Up to 60% more jump height for max charge
			var extra = Math.floor(charge * 0.6);
			self.velocityY = self.jumpStrength - extra;
			LK.getSound('jump').play();
		}
	};
	// Update per frame
	self.update = function () {
		if (self.isJumping) {
			self.y += self.velocityY;
			self.velocityY += self.gravity;
			if (self.y >= self.groundY) {
				self.y = self.groundY;
				self.isJumping = false;
				self.velocityY = 0;
			}
		}
	};
	return self;
});
// Pterodactyl obstacle
var Ptero = Container.expand(function () {
	var self = Container.call(this);
	var pteroSprite = self.attachAsset('ptero', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.width = pteroSprite.width;
	self.height = pteroSprite.height;
	self.speed = 0; // Set by game
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xf5f5f5
});

/**** 
* Game Code
****/ 
// Game constants
// Dinosaur (player)
// Cactus (obstacle)
// Pterodactyl (obstacle)
// Ground
// Jump sound
var GROUND_Y = 2200;
var DINO_START_X = 400;
var OBSTACLE_MIN_GAP = 700;
var OBSTACLE_MAX_GAP = 1200;
var PTERO_MIN_Y = GROUND_Y - 400;
var PTERO_MAX_Y = GROUND_Y - 700;
var GAME_SPEED_START = 22;
var GAME_SPEED_MAX = 60;
var GAME_SPEEDUP_EVERY = 600; // ticks
var GAME_SPEEDUP_AMOUNT = 1.2;
// Game state
var dino;
var ground;
var obstacles = [];
var gameSpeed = GAME_SPEED_START;
var ticksSinceLastObstacle = 0;
var nextObstacleGap = 0;
var score = 0;
var scoreTxt;
var dragNode = null;
var isTouching = false;
var ducking = false;
var lastObstacleType = null;
// Add ground
ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: GROUND_Y + 1
});
game.addChild(ground);
// Add dino
dino = new Dino();
game.addChild(dino);
dino.x = DINO_START_X;
dino.groundY = GROUND_Y;
dino.y = GROUND_Y;
// Score text
scoreTxt = new Text2('0', {
	size: 120,
	fill: "#222"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Helper: spawn obstacle
function spawnObstacle() {
	// Increase obstacle variety as score increases
	var availableTypes = ['cactus', 'ptero'];
	if (score > 500) availableTypes.push('double_cactus');
	if (score > 1200) availableTypes.push('low_ptero');
	if (score > 2000) availableTypes.push('triple_cactus');
	// Randomly pick type, but avoid two pteros in a row
	var type = availableTypes[Math.floor(Math.random() * availableTypes.length)];
	if ((type === 'ptero' || type === 'low_ptero') && lastObstacleType && (lastObstacleType === 'ptero' || lastObstacleType === 'low_ptero')) {
		type = 'cactus';
	}
	lastObstacleType = type;
	var obs;
	if (type === 'cactus') {
		obs = new Cactus();
		obs.x = 2048 + obs.width + Math.floor(Math.random() * 120); // randomize spawn x
		obs.y = GROUND_Y;
		obs.speed = gameSpeed;
		obstacles.push(obs);
		game.addChild(obs);
	} else if (type === 'double_cactus') {
		// Two cacti close together
		for (var i = 0; i < 2; i++) {
			obs = new Cactus();
			obs.x = 2048 + obs.width + i * (obs.width + 60 + Math.floor(Math.random() * 40));
			obs.y = GROUND_Y;
			obs.speed = gameSpeed;
			obstacles.push(obs);
			game.addChild(obs);
		}
	} else if (type === 'triple_cactus') {
		// Three cacti close together
		for (var i = 0; i < 3; i++) {
			obs = new Cactus();
			obs.x = 2048 + obs.width + i * (obs.width + 50 + Math.floor(Math.random() * 30));
			obs.y = GROUND_Y;
			obs.speed = gameSpeed;
			obstacles.push(obs);
			game.addChild(obs);
		}
	} else if (type === 'ptero') {
		obs = new Ptero();
		obs.x = 2048 + obs.width + Math.floor(Math.random() * 120);
		// Randomize ptero height
		obs.y = PTERO_MIN_Y + Math.floor(Math.random() * (PTERO_MAX_Y - PTERO_MIN_Y));
		obs.speed = gameSpeed + 2;
		obstacles.push(obs);
		game.addChild(obs);
	} else if (type === 'low_ptero') {
		obs = new Ptero();
		obs.x = 2048 + obs.width + Math.floor(Math.random() * 120);
		// Lower flying ptero, forces jump
		obs.y = GROUND_Y - 120 - Math.floor(Math.random() * 60);
		obs.speed = gameSpeed + 2.5;
		obstacles.push(obs);
		game.addChild(obs);
	}
}
// Helper: reset game state
function resetGame() {
	// Remove obstacles
	for (var i = 0; i < obstacles.length; i++) {
		obstacles[i].destroy();
	}
	obstacles = [];
	gameSpeed = GAME_SPEED_START;
	ticksSinceLastObstacle = 0;
	// Reset with dynamic gap scaling
	var minGap = Math.max(350, OBSTACLE_MIN_GAP - Math.floor(score / 10));
	var maxGap = Math.max(minGap + 200, OBSTACLE_MAX_GAP - Math.floor(score / 8));
	nextObstacleGap = minGap + Math.floor(Math.random() * (maxGap - minGap));
	score = 0;
	scoreTxt.setText(score);
	dino.x = DINO_START_X;
	dino.y = GROUND_Y;
	dino.isJumping = false;
	dino.velocityY = 0;
	lastObstacleType = null;
}
// Touch/drag controls
// Touch anywhere to jump, and support jump charge for higher jumps
var jumpChargeStart = 0;
var jumpChargeMax = 22; // max frames to charge
var jumpCharge = 0;
var jumpCharging = false;
game.down = function (x, y, obj) {
	isTouching = true;
	jumpCharging = true;
	jumpChargeStart = LK.ticks;
	jumpCharge = 0;
};
game.up = function (x, y, obj) {
	isTouching = false;
	if (jumpCharging) {
		// Calculate charge duration (in frames)
		var chargeFrames = Math.min(jumpCharge, jumpChargeMax);
		dino.jump(chargeFrames);
		jumpCharging = false;
		jumpCharge = 0;
	}
};
game.move = function (x, y, obj) {
	// No ducking, nothing to do here
};
// Main game loop
game.update = function () {
	// Speed up over time
	if (LK.ticks % GAME_SPEEDUP_EVERY === 0 && gameSpeed < GAME_SPEED_MAX) {
		gameSpeed += GAME_SPEEDUP_AMOUNT;
		if (gameSpeed > GAME_SPEED_MAX) gameSpeed = GAME_SPEED_MAX;
	}
	// Update jump charge if holding
	if (jumpCharging) {
		jumpCharge = Math.min(LK.ticks - jumpChargeStart, jumpChargeMax);
	}
	// Update dino
	dino.update();
	// Update obstacles
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obs = obstacles[i];
		obs.speed = gameSpeed + (obs instanceof Ptero ? 2 : 0);
		obs.update();
		// Remove if off screen
		if (obs.x < -300) {
			obs.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Collision detection
		if (dino.intersects(obs)) {
			LK.getSound('hit').play();
			LK.effects.flashScreen(0xff0000, 800);
			LK.showGameOver();
			return;
		}
	}
	// Obstacle spawning
	ticksSinceLastObstacle += gameSpeed;
	// Make gap smaller as score increases (min 350)
	var minGap = Math.max(350, OBSTACLE_MIN_GAP - Math.floor(score / 10));
	var maxGap = Math.max(minGap + 200, OBSTACLE_MAX_GAP - Math.floor(score / 8));
	if (ticksSinceLastObstacle >= nextObstacleGap) {
		spawnObstacle();
		ticksSinceLastObstacle = 0;
		nextObstacleGap = minGap + Math.floor(Math.random() * (maxGap - minGap));
	}
	// Score increases with distance
	score += Math.floor(gameSpeed / 6);
	scoreTxt.setText(score);
	LK.setScore(score);
};
// Reset game state on game start
resetGame();

===================================================================
--- original.js
+++ change.js
@@ -31,51 +31,21 @@
 	self.width = dinoSprite.width;
 	self.height = dinoSprite.height;
 	// State
 	self.isJumping = false;
-	self.isDucking = false;
 	self.velocityY = 0;
 	self.gravity = 2.2 * 1; // gravity is positive, pulls dino down
-	self.jumpStrength = -48; // negative jumpStrength makes dino go up (y decreases)
+	self.jumpStrength = -48; // base jumpStrength (negative: up)
 	self.groundY = 0; // Set after adding to game
-	// Ducking shrinks dino
-	self.setDucking = function (ducking) {
-		if (ducking && !self.isDucking && !self.isJumping) {
-			self.isDucking = true;
-			tween(self, {
-				scaleY: 0.5
-			}, {
-				duration: 120,
-				easing: tween.easeIn
-			});
-			tween(self, {
-				y: self.groundY + self.height * 0.5
-			}, {
-				duration: 120,
-				easing: tween.easeIn
-			});
-			LK.getSound('duck').play();
-		} else if (!ducking && self.isDucking) {
-			self.isDucking = false;
-			tween(self, {
-				scaleY: 1
-			}, {
-				duration: 120,
-				easing: tween.easeOut
-			});
-			tween(self, {
-				y: self.groundY
-			}, {
-				duration: 120,
-				easing: tween.easeOut
-			});
-		}
-	};
-	// Jump
-	self.jump = function () {
-		if (!self.isJumping && !self.isDucking) {
+	// Jump with optional charge parameter
+	self.jump = function (chargeFrames) {
+		if (!self.isJumping) {
 			self.isJumping = true;
-			self.velocityY = self.jumpStrength;
+			// Allow chargeFrames (0..jumpChargeMax) to scale jumpStrength
+			var charge = typeof chargeFrames === "number" ? chargeFrames : 0;
+			// Up to 60% more jump height for max charge
+			var extra = Math.floor(charge * 0.6);
+			self.velocityY = self.jumpStrength - extra;
 			LK.getSound('jump').play();
 		}
 	};
 	// Update per frame
@@ -117,14 +87,14 @@
 
 /**** 
 * Game Code
 ****/ 
-// Jump sound
-// Ground
-// Pterodactyl (obstacle)
-// Cactus (obstacle)
-// Dinosaur (player)
 // Game constants
+// Dinosaur (player)
+// Cactus (obstacle)
+// Pterodactyl (obstacle)
+// Ground
+// Jump sound
 var GROUND_Y = 2200;
 var DINO_START_X = 400;
 var OBSTACLE_MIN_GAP = 700;
 var OBSTACLE_MAX_GAP = 1200;
@@ -244,52 +214,47 @@
 	scoreTxt.setText(score);
 	dino.x = DINO_START_X;
 	dino.y = GROUND_Y;
 	dino.isJumping = false;
-	dino.isDucking = false;
 	dino.velocityY = 0;
-	dino.setDucking(false);
 	lastObstacleType = null;
 }
 // Touch/drag controls
+// Touch anywhere to jump, and support jump charge for higher jumps
+var jumpChargeStart = 0;
+var jumpChargeMax = 22; // max frames to charge
+var jumpCharge = 0;
+var jumpCharging = false;
 game.down = function (x, y, obj) {
 	isTouching = true;
-	// If touch is in lower half, duck; else, jump
-	if (y > 1366) {
-		ducking = true;
-		dino.setDucking(true);
-	} else {
-		dino.jump();
-	}
+	jumpCharging = true;
+	jumpChargeStart = LK.ticks;
+	jumpCharge = 0;
 };
 game.up = function (x, y, obj) {
 	isTouching = false;
-	ducking = false;
-	dino.setDucking(false);
+	if (jumpCharging) {
+		// Calculate charge duration (in frames)
+		var chargeFrames = Math.min(jumpCharge, jumpChargeMax);
+		dino.jump(chargeFrames);
+		jumpCharging = false;
+		jumpCharge = 0;
+	}
 };
 game.move = function (x, y, obj) {
-	// If holding and finger moves to lower half, duck
-	if (isTouching) {
-		if (y > 1366) {
-			if (!ducking) {
-				ducking = true;
-				dino.setDucking(true);
-			}
-		} else {
-			if (ducking) {
-				ducking = false;
-				dino.setDucking(false);
-			}
-		}
-	}
+	// No ducking, nothing to do here
 };
 // Main game loop
 game.update = function () {
 	// Speed up over time
 	if (LK.ticks % GAME_SPEEDUP_EVERY === 0 && gameSpeed < GAME_SPEED_MAX) {
 		gameSpeed += GAME_SPEEDUP_AMOUNT;
 		if (gameSpeed > GAME_SPEED_MAX) gameSpeed = GAME_SPEED_MAX;
 	}
+	// Update jump charge if holding
+	if (jumpCharging) {
+		jumpCharge = Math.min(LK.ticks - jumpChargeStart, jumpChargeMax);
+	}
 	// Update dino
 	dino.update();
 	// Update obstacles
 	for (var i = obstacles.length - 1; i >= 0; i--) {