===================================================================
--- original.js
+++ change.js
@@ -1,6 +1,278 @@
-/****
+/**** 
+* Plugins
+****/ 
+var tween = LK.import("@upit/tween.v1");
+
+/**** 
+* Classes
+****/ 
+var HintButton = Container.expand(function () {
+	var self = Container.call(this);
+	var background = self.attachAsset('hintButton', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	var hintText = new Text2('HINT', {
+		size: 40,
+		fill: 0x333333
+	});
+	hintText.anchor.set(0.5, 0.5);
+	self.addChild(hintText);
+	self.down = function (x, y, obj) {
+		if (selectedCell && !selectedCell.isInitial && selectedCell.value === 0) {
+			var correctValue = getCorrectValueForCell(selectedCell.row, selectedCell.col);
+			selectedCell.setValue(correctValue);
+			checkWinCondition();
+			LK.getSound('correct').play();
+		}
+	};
+	return self;
+});
+var NumberButton = Container.expand(function (number) {
+	var self = Container.call(this);
+	self.number = number;
+	var background = self.attachAsset('numberButton', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	var numberText = new Text2(number.toString(), {
+		size: 60,
+		fill: 0x333333
+	});
+	numberText.anchor.set(0.5, 0.5);
+	self.addChild(numberText);
+	self.down = function (x, y, obj) {
+		if (selectedCell && !selectedCell.isInitial) {
+			selectedCell.setValue(self.number);
+			checkForErrors();
+			checkWinCondition();
+			LK.getSound('correct').play();
+		}
+	};
+	return self;
+});
+var SudokuCell = Container.expand(function (row, col, initialValue) {
+	var self = Container.call(this);
+	self.row = row;
+	self.col = col;
+	self.value = initialValue || 0;
+	self.isInitial = initialValue > 0;
+	self.isSelected = false;
+	self.hasError = false;
+	// Create border (thick for 3x3 box boundaries)
+	var needsThickBorder = row % 3 === 0 || col % 3 === 0;
+	var border = self.attachAsset(needsThickBorder ? 'thickBorder' : 'cellBorder', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Create cell background
+	self.background = self.attachAsset('cell', {
+		anchorX: 0.5,
+		anchorY: 0.5
+	});
+	// Create number text
+	self.numberText = new Text2(self.value > 0 ? self.value.toString() : '', {
+		size: 80,
+		fill: self.isInitial ? "#000000" : "#0066cc"
+	});
+	self.numberText.anchor.set(0.5, 0.5);
+	self.addChild(self.numberText);
+	self.setValue = function (newValue) {
+		if (self.isInitial) return;
+		self.value = newValue;
+		self.numberText.setText(newValue > 0 ? newValue.toString() : '');
+		self.updateDisplay();
+	};
+	self.setSelected = function (selected) {
+		self.isSelected = selected;
+		self.updateDisplay();
+	};
+	self.setError = function (error) {
+		self.hasError = error;
+		self.updateDisplay();
+	};
+	self.updateDisplay = function () {
+		if (self.hasError) {
+			self.removeChild(self.background);
+			self.background = self.attachAsset('errorCell', {
+				anchorX: 0.5,
+				anchorY: 0.5
+			});
+			self.addChildAt(self.background, 1);
+		} else if (self.isSelected) {
+			self.removeChild(self.background);
+			self.background = self.attachAsset('selectedCell', {
+				anchorX: 0.5,
+				anchorY: 0.5
+			});
+			self.addChildAt(self.background, 1);
+		} else {
+			self.removeChild(self.background);
+			self.background = self.attachAsset('cell', {
+				anchorX: 0.5,
+				anchorY: 0.5
+			});
+			self.addChildAt(self.background, 1);
+		}
+	};
+	self.down = function (x, y, obj) {
+		if (!self.isInitial) {
+			selectedCell = self;
+			updateCellSelection();
+			LK.getSound('select').play();
+		}
+	};
+	return self;
+});
+
+/**** 
 * Initialize Game
-****/
+****/ 
 var game = new LK.Game({
-	backgroundColor: 0x000000
-});
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+	backgroundColor: 0xf0f0f0
+});
+
+/**** 
+* Game Code
+****/ 
+// Game variables
+var grid = [];
+var selectedCell = null;
+var numberButtons = [];
+var startTime = Date.now();
+var isComplete = false;
+// Sudoku puzzle (easy difficulty)
+var puzzleData = [[5, 3, 0, 0, 7, 0, 0, 0, 0], [6, 0, 0, 1, 9, 5, 0, 0, 0], [0, 9, 8, 0, 0, 0, 0, 6, 0], [8, 0, 0, 0, 6, 0, 0, 0, 3], [4, 0, 0, 8, 0, 3, 0, 0, 1], [7, 0, 0, 0, 2, 0, 0, 0, 6], [0, 6, 0, 0, 0, 0, 2, 8, 0], [0, 0, 0, 4, 1, 9, 0, 0, 5], [0, 0, 0, 0, 8, 0, 0, 7, 9]];
+// Solution for validation
+var solution = [[5, 3, 4, 6, 7, 8, 9, 1, 2], [6, 7, 2, 1, 9, 5, 3, 4, 8], [1, 9, 8, 3, 4, 2, 5, 6, 7], [8, 5, 9, 7, 6, 1, 4, 2, 3], [4, 2, 6, 8, 5, 3, 7, 9, 1], [7, 1, 3, 9, 2, 4, 8, 5, 6], [9, 6, 1, 5, 3, 7, 2, 8, 4], [2, 8, 7, 4, 1, 9, 6, 3, 5], [3, 4, 5, 2, 8, 6, 1, 7, 9]];
+// Create grid background
+var gridBg = game.attachAsset('gridBackground', {
+	anchorX: 0.5,
+	anchorY: 0.5,
+	x: 1024,
+	y: 1100
+});
+// Create Sudoku grid
+for (var row = 0; row < 9; row++) {
+	grid[row] = [];
+	for (var col = 0; col < 9; col++) {
+		var cell = new SudokuCell(row, col, puzzleData[row][col]);
+		cell.x = 1024 + (col - 4) * 200;
+		cell.y = 1100 + (row - 4) * 200;
+		grid[row][col] = cell;
+		game.addChild(cell);
+	}
+}
+// Create number buttons
+var buttonStartX = 300;
+var buttonY = 2400;
+for (var i = 1; i <= 9; i++) {
+	var button = new NumberButton(i);
+	button.x = buttonStartX + (i - 1) * 180;
+	button.y = buttonY;
+	numberButtons.push(button);
+	game.addChild(button);
+}
+// Create hint button
+var hintBtn = new HintButton();
+hintBtn.x = 1024;
+hintBtn.y = 2550;
+game.addChild(hintBtn);
+// Create timer display
+var timerText = new Text2('Time: 00:00', {
+	size: 60,
+	fill: 0x333333
+});
+timerText.anchor.set(0.5, 0);
+LK.gui.top.addChild(timerText);
+timerText.y = 100;
+// Helper functions
+function updateCellSelection() {
+	for (var row = 0; row < 9; row++) {
+		for (var col = 0; col < 9; col++) {
+			grid[row][col].setSelected(grid[row][col] === selectedCell);
+		}
+	}
+}
+function checkForErrors() {
+	// Clear all errors first
+	for (var row = 0; row < 9; row++) {
+		for (var col = 0; col < 9; col++) {
+			grid[row][col].setError(false);
+		}
+	}
+	// Check for conflicts
+	for (var row = 0; row < 9; row++) {
+		for (var col = 0; col < 9; col++) {
+			var cell = grid[row][col];
+			if (cell.value > 0) {
+				if (hasConflict(row, col, cell.value)) {
+					cell.setError(true);
+				}
+			}
+		}
+	}
+}
+function hasConflict(row, col, value) {
+	// Check row
+	for (var c = 0; c < 9; c++) {
+		if (c !== col && grid[row][c].value === value) {
+			return true;
+		}
+	}
+	// Check column  
+	for (var r = 0; r < 9; r++) {
+		if (r !== row && grid[r][col].value === value) {
+			return true;
+		}
+	}
+	// Check 3x3 box
+	var boxRow = Math.floor(row / 3) * 3;
+	var boxCol = Math.floor(col / 3) * 3;
+	for (var r = boxRow; r < boxRow + 3; r++) {
+		for (var c = boxCol; c < boxCol + 3; c++) {
+			if ((r !== row || c !== col) && grid[r][c].value === value) {
+				return true;
+			}
+		}
+	}
+	return false;
+}
+function getCorrectValueForCell(row, col) {
+	return solution[row][col];
+}
+function checkWinCondition() {
+	if (isComplete) return;
+	var allFilled = true;
+	var hasErrors = false;
+	for (var row = 0; row < 9; row++) {
+		for (var col = 0; col < 9; col++) {
+			var cell = grid[row][col];
+			if (cell.value === 0) {
+				allFilled = false;
+			}
+			if (cell.hasError) {
+				hasErrors = true;
+			}
+		}
+	}
+	if (allFilled && !hasErrors) {
+		isComplete = true;
+		LK.getSound('complete').play();
+		LK.effects.flashScreen(0x00ff00, 1000);
+		LK.setTimeout(function () {
+			LK.showYouWin();
+		}, 1500);
+	}
+}
+function formatTime(seconds) {
+	var mins = Math.floor(seconds / 60);
+	var secs = seconds % 60;
+	return 'Time: ' + (mins < 10 ? '0' : '') + mins + ':' + (secs < 10 ? '0' : '') + secs;
+}
+game.update = function () {
+	if (!isComplete) {
+		var currentTime = Math.floor((Date.now() - startTime) / 1000);
+		timerText.setText(formatTime(currentTime));
+	}
+};
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