===================================================================
--- original.js
+++ change.js
@@ -1,24 +1,12 @@
 /**** 
 * Classes
 ****/
-// RedApple class
-var RedApple = Container.expand(function () {
-	var self = Container.call(this);
-	var appleGraphics = self.createAsset('redApple', 'Falling red apple', 0.5, 0.5);
-	self.onCatch = function (textBox) {
-		var formula = 'f(x)dx = F(b) - F(a)';
-		var currentText = textBox.children[0].text;
-		var nextIndex = currentText.length;
-		if (nextIndex < formula.length) {
-			textBox.setText(currentText + formula[nextIndex]);
-		}
-	};
-});
 // Player class
 var Player = Container.expand(function () {
 	var self = Container.call(this);
 	var playerGraphics = self.createAsset('player', 'Player character', 0.5, 1);
+	self.displayedF = false;
 	self.speed = 5;
 	self.targetX = self.x;
 	self.moveLeft = function () {
 		if (self.x > self.targetX && self.x > playerGraphics.width / 2) {
@@ -58,25 +46,8 @@
 		var appleBottomY = self.y + self.height / 2;
 		return self.intersects(player) && appleBottomY < playerHeadY;
 	};
 });
-// TextBox class
-var TextBox = Container.expand(function () {
-	var self = Container.call(this);
-	var textBoxGraphics = self.createAsset('textBox', 'Text Box', 1, 0);
-	self.setText = function (text) {
-		self.removeChildren();
-		var textElement = new Text2(text, {
-			size: 50,
-			fill: "#ff0000",
-			anchor: {
-				x: 1,
-				y: 0
-			}
-		});
-		self.addChild(textElement);
-	};
-});
 
 /**** 
 * Initialize Game
 ****/
@@ -131,17 +102,17 @@
 	// Move apples
 	for (var i = apples.length - 1; i >= 0; i--) {
 		apples[i].move();
 		// Check if apple is caught by the player
-		if (apples[i] instanceof RedApple && apples[i].isCaught(player)) {
-			// Call onCatch method to update the TextBox
-			apples[i].onCatch(textBox);
-			// Remove caught apple
-			apples[i].destroy();
-			apples.splice(i, 1);
-		} else if (apples[i] instanceof Apple && apples[i].isCaught(player)) {
-			// Increase score for non-red apples
+		if (apples[i].isCaught(player)) {
+			// Increase score
 			LK.setScore(LK.getScore() + 1);
+			// Display the 'F' symbol if this is the first red apple caught
+			if (!player.displayedF && apples[i] instanceof Apple) {
+				var fSymbol = LK.getAsset('fSymbol', 'F symbol', 1, 0);
+				LK.gui.topRight.addChild(fSymbol);
+				player.displayedF = true;
+			}
 			// Remove caught apple
 			apples[i].destroy();
 			apples.splice(i, 1);
 		} else if (apples[i].y > 2732) {
@@ -153,14 +124,11 @@
 
 	// Spawn apples less frequently
 	if (LK.ticks % 120 == 0) {
 		// Every two seconds
-		var newApple = Math.random() < 0.5 ? new RedApple() : new GreenApple();
+		var newApple = Math.random() < 0.5 ? new Apple() : new GreenApple();
 		newApple.x = Math.random() * 2048;
 		newApple.y = -50; // Start off-screen
 		apples.push(newApple);
 		game.addChild(newApple);
 	}
-}); // Initialize text box
-var textBox = new TextBox();
-textBox.setText("Score: 0");
-LK.gui.topRight.addChild(textBox);
\ No newline at end of file
+});
\ No newline at end of file