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

/**** 
* Classes
****/ 
var DeleteButton = Container.expand(function () {
	var self = Container.call(this);
	var background = self.attachAsset('numberButton', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var deleteText = new Text2('CLEAR', {
		size: 35,
		fill: 0x333333
	});
	deleteText.anchor.set(0.5, 0.5);
	self.addChild(deleteText);
	self.down = function (x, y, obj) {
		if (selectedCell && !selectedCell.isInitial && selectedCell.value > 0) {
			selectedCell.setValue(0);
			checkForErrors();
			LK.getSound('select').play();
		}
	};
	return self;
});
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: 0xf0f0f0
});

/**** 
* Game Code
****/ 
// Game variables
var grid = [];
var selectedCell = null;
var numberButtons = [];
var startTime = Date.now();
var isComplete = false;
// Sudoku generator functions
function createEmptyGrid() {
	var grid = [];
	for (var i = 0; i < 9; i++) {
		grid[i] = [];
		for (var j = 0; j < 9; j++) {
			grid[i][j] = 0;
		}
	}
	return grid;
}
function isValidPlacement(grid, row, col, num) {
	// Check row
	for (var c = 0; c < 9; c++) {
		if (grid[row][c] === num) return false;
	}
	// Check column
	for (var r = 0; r < 9; r++) {
		if (grid[r][col] === num) return false;
	}
	// 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 (grid[r][c] === num) return false;
		}
	}
	return true;
}
function shuffleArray(array) {
	for (var i = array.length - 1; i > 0; i--) {
		var j = Math.floor(Math.random() * (i + 1));
		var temp = array[i];
		array[i] = array[j];
		array[j] = temp;
	}
	return array;
}
function fillGrid(grid) {
	for (var row = 0; row < 9; row++) {
		for (var col = 0; col < 9; col++) {
			if (grid[row][col] === 0) {
				var numbers = shuffleArray([1, 2, 3, 4, 5, 6, 7, 8, 9]);
				for (var i = 0; i < numbers.length; i++) {
					var num = numbers[i];
					if (isValidPlacement(grid, row, col, num)) {
						grid[row][col] = num;
						if (fillGrid(grid)) {
							return true;
						}
						grid[row][col] = 0;
					}
				}
				return false;
			}
		}
	}
	return true;
}
function createPuzzle(difficulty) {
	var grid = createEmptyGrid();
	fillGrid(grid);
	// Create a copy for the solution
	var solution = [];
	for (var i = 0; i < 9; i++) {
		solution[i] = [];
		for (var j = 0; j < 9; j++) {
			solution[i][j] = grid[i][j];
		}
	}
	// Remove cells based on difficulty
	var cellsToRemove = difficulty === 'easy' ? 40 : difficulty === 'medium' ? 45 : 50;
	var removed = 0;
	while (removed < cellsToRemove) {
		var row = Math.floor(Math.random() * 9);
		var col = Math.floor(Math.random() * 9);
		if (grid[row][col] !== 0) {
			grid[row][col] = 0;
			removed++;
		}
	}
	return {
		puzzle: grid,
		solution: solution
	};
}
// Generate random puzzle
var gameData = createPuzzle('easy');
var puzzleData = gameData.puzzle;
var solution = gameData.solution;
// Create grid background
var gridBg = game.attachAsset('gridBackground', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 1024,
	y: 1100
});
// Create 3x3 box backgrounds for visual distinction
for (var boxRow = 0; boxRow < 3; boxRow++) {
	for (var boxCol = 0; boxCol < 3; boxCol++) {
		var boxIndex = boxRow * 3 + boxCol;
		// Add thick border around each box
		var boxBorder = game.attachAsset('boxBorder', {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 1024 + (boxCol - 1) * 600,
			y: 1100 + (boxRow - 1) * 600
		});
		// Add colored background
		var boxBg = game.attachAsset('boxBackground' + boxIndex, {
			anchorX: 0.5,
			anchorY: 0.5,
			x: 1024 + (boxCol - 1) * 600,
			y: 1100 + (boxRow - 1) * 600
		});
	}
}
// 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 delete button
var deleteBtn = new DeleteButton();
deleteBtn.x = buttonStartX + 9 * 180;
deleteBtn.y = buttonY;
game.addChild(deleteBtn);
// 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 = 50;
// 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;
}
// Start background music
LK.playMusic('bgmusic');
game.update = function () {
	if (!isComplete) {
		var currentTime = Math.floor((Date.now() - startTime) / 1000);
		timerText.setText(formatTime(currentTime));
	}
};

===================================================================
--- original.js
+++ change.js
@@ -26,44 +26,8 @@
 		}
 	};
 	return self;
 });
-var DifficultyButton = Container.expand(function (difficulty, label) {
-	var self = Container.call(this);
-	self.difficulty = difficulty;
-	self.isSelected = difficulty === 'easy';
-	var background = self.attachAsset('numberButton', {
-		anchorX: 0.5,
-		anchorY: 0.5
-	});
-	var buttonText = new Text2(label, {
-		size: 30,
-		fill: self.isSelected ? 0xffffff : 0x333333
-	});
-	buttonText.anchor.set(0.5, 0.5);
-	self.addChild(buttonText);
-	self.buttonText = buttonText;
-	self.setSelected = function (selected) {
-		self.isSelected = selected;
-		self.removeChild(background);
-		background = self.attachAsset('numberButton', {
-			anchorX: 0.5,
-			anchorY: 0.5
-		});
-		self.addChildAt(background, 0);
-		background.tint = selected ? 0x4CAF50 : 0xe0e0e0;
-		self.buttonText.tint = selected ? 0xffffff : 0x333333;
-	};
-	self.down = function (x, y, obj) {
-		currentDifficulty = self.difficulty;
-		for (var i = 0; i < difficultyButtons.length; i++) {
-			difficultyButtons[i].setSelected(difficultyButtons[i].difficulty === currentDifficulty);
-		}
-		restartGame();
-		LK.getSound('select').play();
-	};
-	return self;
-});
 var HintButton = Container.expand(function () {
 	var self = Container.call(this);
 	var background = self.attachAsset('hintButton', {
 		anchorX: 0.5,
@@ -197,10 +161,8 @@
 var selectedCell = null;
 var numberButtons = [];
 var startTime = Date.now();
 var isComplete = false;
-var currentDifficulty = 'easy';
-var difficultyButtons = [];
 // Sudoku generator functions
 function createEmptyGrid() {
 	var grid = [];
 	for (var i = 0; i < 9; i++) {
@@ -287,9 +249,9 @@
 		solution: solution
 	};
 }
 // Generate random puzzle
-var gameData = createPuzzle(currentDifficulty);
+var gameData = createPuzzle('easy');
 var puzzleData = gameData.puzzle;
 var solution = gameData.solution;
 // Create grid background
 var gridBg = game.attachAsset('gridBackground', {
@@ -343,26 +305,8 @@
 var deleteBtn = new DeleteButton();
 deleteBtn.x = buttonStartX + 9 * 180;
 deleteBtn.y = buttonY;
 game.addChild(deleteBtn);
-// Create difficulty buttons
-var difficulties = [{
-	key: 'easy',
-	label: 'EASY'
-}, {
-	key: 'medium',
-	label: 'MEDIUM'
-}, {
-	key: 'hard',
-	label: 'HARD'
-}];
-for (var i = 0; i < difficulties.length; i++) {
-	var diffBtn = new DifficultyButton(difficulties[i].key, difficulties[i].label);
-	diffBtn.x = 400 + i * 250;
-	diffBtn.y = 350;
-	difficultyButtons.push(diffBtn);
-	game.addChild(diffBtn);
-}
 // Create hint button
 var hintBtn = new HintButton();
 hintBtn.x = 1024;
 hintBtn.y = 2550;
@@ -374,16 +318,8 @@
 });
 timerText.anchor.set(0.5, 0);
 LK.gui.top.addChild(timerText);
 timerText.y = 50;
-// Create difficulty display
-var difficultyText = new Text2('Difficulty: EASY', {
-	size: 50,
-	fill: 0x333333
-});
-difficultyText.anchor.set(0.5, 0);
-LK.gui.top.addChild(difficultyText);
-difficultyText.y = 120;
 // Helper functions
 function updateCellSelection() {
 	for (var row = 0; row < 9; row++) {
 		for (var col = 0; col < 9; col++) {
@@ -461,46 +397,17 @@
 			LK.showYouWin();
 		}, 1500);
 	}
 }
-function restartGame() {
-	// Clear existing grid
-	for (var row = 0; row < 9; row++) {
-		for (var col = 0; col < 9; col++) {
-			if (grid[row] && grid[row][col]) {
-				grid[row][col].destroy();
-			}
-		}
-	}
-	grid = [];
-	// Generate new puzzle with current difficulty
-	gameData = createPuzzle(currentDifficulty);
-	puzzleData = gameData.puzzle;
-	solution = gameData.solution;
-	// Recreate 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);
-		}
-	}
-	// Reset game state
-	selectedCell = null;
-	startTime = Date.now();
-	isComplete = false;
-}
 function formatTime(seconds) {
 	var mins = Math.floor(seconds / 60);
 	var secs = seconds % 60;
 	return 'Time: ' + (mins < 10 ? '0' : '') + mins + ':' + (secs < 10 ? '0' : '') + secs;
 }
+// Start background music
+LK.playMusic('bgmusic');
 game.update = function () {
 	if (!isComplete) {
 		var currentTime = Math.floor((Date.now() - startTime) / 1000);
 		timerText.setText(formatTime(currentTime));
-		difficultyText.setText('Difficulty: ' + currentDifficulty.toUpperCase());
 	}
 };
\ No newline at end of file