/**** 
* 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: 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 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 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;
}
game.update = function () {
	if (!isComplete) {
		var currentTime = Math.floor((Date.now() - startTime) / 1000);
		timerText.setText(formatTime(currentTime));
	}
};

===================================================================
--- original.js
+++ change.js
@@ -155,8 +155,16 @@
 // 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,