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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Advanced 9×9 Sudoku</title>
<script src="https://cdn.tailwindcss.com"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
<style>
.cell {
width: 50px;
height: 50px;
text-align: center;
font-size: 1.5rem;
font-weight: bold;
position: relative;
transition: all 0.2s;
}
.cell:focus {
outline: none;
background-color: #e2e8f0;
transform: scale(1.05);
z-index: 10;
}
.cell.prefilled {
background-color: #f0f4f8;
color: #1e40af;
}
.cell.error {
color: #dc2626;
animation: shake 0.5s;
}
.cell.highlight {
background-color: #dbeafe;
}
.cell.same-number {
background-color: #bfdbfe;
}
.cell:nth-child(3n) {
border-right: 2px solid #4a5568;
}
.cell:nth-child(9n) {
border-right: 1px solid #cbd5e0;
}
.row:nth-child(3n) .cell {
border-bottom: 2px solid #4a5568;
}
.row:last-child .cell {
border-bottom: none;
}
.row .cell:last-child {
border-right: none;
}
@keyframes shake {
0%, 100% { transform: translateX(0); }
20%, 60% { transform: translateX(-5px); }
40%, 80% { transform: translateX(5px); }
}
.number-btn.active {
background-color: #3b82f6;
color: white;
}
.timer {
font-family: monospace;
}
</style>
</head>
<body class="bg-gray-100 min-h-screen flex items-center justify-center p-4">
<div class="bg-white rounded-xl shadow-2xl p-6 max-w-4xl w-full">
<div class="flex flex-col md:flex-row gap-8">
<!-- Game Board -->
<div class="flex-1">
<div class="flex justify-between items-center mb-4">
<h1 class="text-3xl font-bold text-indigo-700">
<i class="fas fa-th mr-2"></i>Advanced Sudoku
</h1>
<div class="timer text-xl font-mono bg-gray-200 px-3 py-1 rounded">
<i class="fas fa-clock mr-2"></i><span id="time">00:00</span>
</div>
</div>
<!-- Sudoku Board -->
<div class="border-2 border-gray-800 rounded mb-4" id="sudoku-board">
<!-- Rows will be generated by JavaScript -->
</div>
<!-- Number Pad -->
<div class="grid grid-cols-9 gap-1 mb-4">
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="1">1</button>
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="2">2</button>
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="3">3</button>
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="4">4</button>
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="5">5</button>
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="6">6</button>
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="7">7</button>
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="8">8</button>
<button class="number-btn bg-gray-200 hover:bg-gray-300 h-10 rounded flex items-center justify-center font-bold" data-number="9">9</button>
</div>
<!-- Controls -->
<div class="flex gap-2">
<button id="new-game" class="flex-1 bg-indigo-600 hover:bg-indigo-700 text-white py-2 px-4 rounded flex items-center justify-center">
<i class="fas fa-plus-circle mr-2"></i>New Game
</button>
<button id="check" class="flex-1 bg-green-600 hover:bg-green-700 text-white py-2 px-4 rounded flex items-center justify-center">
<i class="fas fa-check mr-2"></i>Check
</button>
<button id="hint" class="flex-1 bg-yellow-500 hover:bg-yellow-600 text-white py-2 px-4 rounded flex items-center justify-center">
<i class="fas fa-lightbulb mr-2"></i>Hint
</button>
<button id="solve" class="flex-1 bg-purple-600 hover:bg-purple-700 text-white py-2 px-4 rounded flex items-center justify-center">
<i class="fas fa-magic mr-2"></i>Solve
</button>
</div>
</div>
<!-- Game Info -->
<div class="md:w-64 flex flex-col gap-4">
<div class="bg-gray-100 p-4 rounded-lg">
<h3 class="font-bold text-lg mb-2 text-indigo-700">
<i class="fas fa-info-circle mr-2"></i>How to Play
</h3>
<ul class="text-sm space-y-2">
<li>Fill the grid so each row, column, and 3×3 box contains 1-9</li>
<li>Click a cell and select a number</li>
<li>Use <span class="font-bold">Check</span> to validate your solution</li>
<li>Stuck? Get a <span class="font-bold">Hint</span></li>
</ul>
</div>
<div class="bg-gray-100 p-4 rounded-lg">
<h3 class="font-bold text-lg mb-2 text-indigo-700">
<i class="fas fa-trophy mr-2"></i>Difficulty
</h3>
<div class="flex flex-col gap-2">
<button class="difficulty-btn active bg-green-100 hover:bg-green-200 text-green-800 py-1 px-3 rounded text-left" data-difficulty="easy">
<i class="fas fa-seedling mr-2"></i>Easy
</button>
<button class="difficulty-btn bg-yellow-100 hover:bg-yellow-200 text-yellow-800 py-1 px-3 rounded text-left" data-difficulty="medium">
<i class="fas fa-tree mr-2"></i>Medium
</button>
<button class="difficulty-btn bg-red-100 hover:bg-red-200 text-red-800 py-1 px-3 rounded text-left" data-difficulty="hard">
<i class="fas fa-fire mr-2"></i>Hard
</button>
</div>
</div>
<div class="bg-gray-100 p-4 rounded-lg flex-1">
<h3 class="font-bold text-lg mb-2 text-indigo-700">
<i class="fas fa-history mr-2"></i>Stats
</h3>
<div class="space-y-2 text-sm">
<div>Games Played: <span id="games-played" class="font-bold">0</span></div>
<div>Games Won: <span id="games-won" class="font-bold">0</span></div>
<div>Best Time: <span id="best-time" class="font-bold">--:--</span></div>
</div>
</div>
</div>
</div>
</div>
<script>
// Game state
let board = Array(9).fill().map(() => Array(9).fill(0));
let solution = Array(9).fill().map(() => Array(9).fill(0));
let selectedCell = null;
let selectedNumber = null;
let timer = null;
let seconds = 0;
let difficulty = 'easy';
let gamesPlayed = 0;
let gamesWon = 0;
let bestTime = null;
// DOM elements
const sudokuBoard = document.getElementById('sudoku-board');
const numberButtons = document.querySelectorAll('.number-btn');
const difficultyButtons = document.querySelectorAll('.difficulty-btn');
const timeDisplay = document.getElementById('time');
const newGameBtn = document.getElementById('new-game');
const checkBtn = document.getElementById('check');
const hintBtn = document.getElementById('hint');
const solveBtn = document.getElementById('solve');
// Initialize the game
function initGame() {
// Clear previous board
sudokuBoard.innerHTML = '';
// Generate a new Sudoku puzzle
generateSudoku();
// Create the board UI
createBoardUI();
// Reset timer
resetTimer();
startTimer();
// Update stats
updateStats();
}
// Generate a Sudoku puzzle
function generateSudoku() {
// Generate a complete solution
generateSolution();
// Copy solution to board
for (let i = 0; i < 9; i++) {
for (let j = 0; j < 9; j++) {
board[i][j] = solution[i][j];
}
}
// Remove numbers based on difficulty
let cellsToRemove;
switch(difficulty) {
case 'easy':
cellsToRemove = 40;
break;
case 'medium':
cellsToRemove = 50;
break;
case 'hard':
cellsToRemove = 60;
break;
default:
cellsToRemove = 40;
}
// Remove numbers
let removed = 0;
while (removed < cellsToRemove) {
const row = Math.floor(Math.random() * 9);
const col = Math.floor(Math.random() * 9);
if (board[row][col] !== 0) {
board[row][col] = 0;
removed++;
}
}
}
// Generate a complete Sudoku solution
function generateSolution() {
// Reset solution
solution = Array(9).fill().map(() => Array(9).fill(0));
// Fill diagonal 3x3 boxes first (they are independent)
fillDiagonalBoxes();
// Solve the rest of the puzzle
solveSudoku(solution);
}
// Fill diagonal 3x3 boxes
function fillDiagonalBoxes() {
for (let box = 0; box < 9; box += 3) {
fillBox(box, box);
}
}
// Fill a 3x3 box
function fillBox(row, col) {
const nums = [1, 2, 3, 4, 5, 6, 7, 8, 9];
shuffleArray(nums);
let index = 0;
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 3; j++) {
solution[row + i][col + j] = nums[index++];
}
}
}
// Shuffle an array
function shuffleArray(array) {
for (let i = array.length - 1; i > 0; i--) {
const j = Math.floor(Math.random() * (i + 1));
[array[i], array[j]] = [array[j], array[i]];
}
}
// Solve Sudoku using backtracking
function solveSudoku(grid) {
for (let row = 0; row < 9; row++) {
for (let col = 0; col < 9; col++) {
if (grid[row][col] === 0) {
for (let num = 1; num <= 9; num++) {
if (isValid(grid, row, col, num)) {
grid[row][col] = num;
if (solveSudoku(grid)) {
return true;
}
grid[row][col] = 0;
}
}
return false;
}
}
}
return true;
}
// Check if a number is valid in a position
function isValid(grid, row, col, num) {
// Check row
for (let x = 0; x < 9; x++) {
if (grid[row][x] === num) return false;
}
// Check column
for (let x = 0; x < 9; x++) {
if (grid[x][col] === num) return false;
}
// Check 3x3 box
const boxRow = Math.floor(row / 3) * 3;
const boxCol = Math.floor(col / 3) * 3;
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 3; j++) {
if (grid[boxRow + i][boxCol + j] === num) return false;
}
}
return true;
}
// Create the board UI
function createBoardUI() {
for (let i = 0; i < 9; i++) {
const row = document.createElement('div');
row.className = 'row flex';
for (let j = 0; j < 9; j++) {
const cell = document.createElement('input');
cell.className = 'cell border border-gray-300';
cell.type = 'text';
cell.maxLength = 1;
cell.dataset.row = i;
cell.dataset.col = j;
// Set value if it's a prefilled cell
if (board[i][j] !== 0) {
cell.value = board[i][j];
cell.classList.add('prefilled');
cell.readOnly = true;
}
// Event listeners
cell.addEventListener('focus', handleCellFocus);
cell.addEventListener('input', handleCellInput);
cell.addEventListener('keydown', handleCellKeyDown);
cell.addEventListener('click', handleCellClick);
row.appendChild(cell);
}
sudokuBoard.appendChild(row);
}
}
// Handle cell focus
function handleCellFocus(e) {
const cell = e.target;
const row = parseInt(cell.dataset.row);
const col = parseInt(cell.dataset.col);
// Clear previous highlights
clearHighlights();
// Highlight current cell
cell.classList.add('highlight');
// Highlight same number cells
if (cell.value) {
highlightSameNumbers(cell.value);
}
// Highlight row, column, and box
highlightRelatedCells(row, col);
// Update selected cell
selectedCell = cell;
}
// Handle cell input
function handleCellInput(e) {
const cell = e.target;
const value = cell.value;
// Only allow numbers 1-9
if (value && !/^[1-9]$/.test(value)) {
cell.value = '';
return;
}
// Clear error state
cell.classList.remove('error');
// Update same number highlights
if (value) {
highlightSameNumbers(value);
} else {
clearSameNumberHighlights();
}
}
// Handle cell key down (for navigation)
function handleCellKeyDown(e) {
const cell = e.target;
const row = parseInt(cell.dataset.row);
const col = parseInt(cell.dataset.col);
let newRow = row;
let newCol = col;
switch(e.key) {
case 'ArrowUp':
newRow = Math.max(0, row - 1);
break;
case 'ArrowDown':
newRow = Math.min(8, row + 1);
break;
case 'ArrowLeft':
newCol = Math.max(0, col - 1);
break;
case 'ArrowRight':
newCol = Math.min(8, col + 1);
break;
default:
return;
}
if (newRow !== row || newCol !== col) {
const newCell = document.querySelector(`.cell[data-row="${newRow}"][data-col="${newCol}"]`);
if (newCell && !newCell.classList.contains('prefilled')) {
newCell.focus();
}
}
}
// Handle cell click
function handleCellClick(e) {
const cell = e.target;
if (selectedNumber && !cell.classList.contains('prefilled')) {
cell.value = selectedNumber;
cell.dispatchEvent(new Event('input'));
}
}
// Highlight related cells (row, column, box)
function highlightRelatedCells(row, col) {
// Highlight row and column
for (let i = 0; i < 9; i++) {
const rowCell = document.querySelector(`.cell[data-row="${row}"][data-col="${i}"]`);
const colCell = document.querySelector(`.cell[data-row="${i}"][data-col="${col}"]`);
if (rowCell) rowCell.classList.add('highlight');
if (colCell) colCell.classList.add('highlight');
}
// Highlight 3x3 box
const boxRow = Math.floor(row / 3) * 3;
const boxCol = Math.floor(col / 3) * 3;
for (let i = 0; i < 3; i++) {
for (let j = 0; j < 3; j++) {
const cell = document.querySelector(`.cell[data-row="${boxRow + i}"][data-col="${boxCol + j}"]`);
if (cell) cell.classList.add('highlight');
}
}
}
// Highlight cells with the same number
function highlightSameNumbers(num) {
const cells = document.querySelectorAll('.cell');
cells.forEach(cell => {
if (cell.value === num) {
cell.classList.add('same-number');
}
});
}
// Clear all highlights
function clearHighlights() {
const cells = document.querySelectorAll('.cell');
cells.forEach(cell => {
cell.classList.remove('highlight', 'same-number');
});
}
// Clear same number highlights
function clearSameNumberHighlights() {
const cells = document.querySelectorAll('.cell');
cells.forEach(cell => {
cell.classList.remove('same-number');
});
}
// Start timer
function startTimer() {
if (timer) clearInterval(timer);
seconds = 0;
updateTimerDisplay();
timer = setInterval(() => {
seconds++;
updateTimerDisplay();
}, 1000);
}
// Reset timer
function resetTimer() {
if (timer) clearInterval(timer);
seconds = 0;
updateTimerDisplay();
}
// Update timer display
function updateTimerDisplay() {
const minutes = Math.floor(seconds / 60);
const remainingSeconds = seconds % 60;
timeDisplay.textContent = `${minutes.toString().padStart(2, '0')}:${remainingSeconds.toString().padStart(2, '0')}`;
}
// Update stats
function updateStats() {
document.getElementById('games-played').textContent = gamesPlayed;
document.getElementById('games-won').textContent = gamesWon;
if (bestTime !== null) {
const minutes = Math.floor(bestTime / 60);
const seconds = bestTime % 60;
document.getElementById('best-time').textContent = `${minutes.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')}`;
} else {
document.getElementById('best-time').textContent = '--:--';
}
}
// Check if the board is complete and correct
function checkSolution() {
let isComplete = true;
let isCorrect = true;
// Check each cell
for (let i = 0; i < 9; i++) {
for (let j = 0; j < 9; j++) {
const cell = document.querySelector(`.cell[data-row="${i}"][data-col="${j}"]`);
if (!cell.value) {
isComplete = false;
continue;
}
const num = parseInt(cell.value);
if (num !== solution[i][j]) {
cell.classList.add('error');
isCorrect = false;
}
}
}
if (!isComplete) {
alert('The puzzle is not complete yet!');
return false;
}
if (!isCorrect) {
alert('There are errors in your solution. Please check the highlighted cells.');
return false;
}
return true;
}
// Provide a hint
function giveHint() {
if (!selectedCell || selectedCell.classList.contains('prefilled')) {
alert('Please select an empty cell first!');
return;
}
const row = parseInt(selectedCell.dataset.row);
const col = parseInt(selectedCell.dataset.col);
selectedCell.value = solution[row][col];
selectedCell.classList.remove('error');
selectedCell.dispatchEvent(new Event('input'));
// Check if the puzzle is complete
if (isPuzzleComplete()) {
handleWin();
}
}
// Solve the puzzle
function solvePuzzle() {
if (confirm('Are you sure you want to see the solution?')) {
for (let i = 0; i < 9; i++) {
for (let j = 0; j < 9; j++) {
const cell = document.querySelector(`.cell[data-row="${i}"][data-col="${j}"]`);
if (!cell.classList.contains('prefilled')) {
cell.value = solution[i][j];
cell.classList.remove('error');
}
}
}
clearInterval(timer);
alert('Puzzle solved!');
}
}
// Check if puzzle is complete
function isPuzzleComplete() {
for (let i = 0; i < 9; i++) {
for (let j = 0; j < 9; j++) {
const cell = document.querySelector(`.cell[data-row="${i}"][data-col="${j}"]`);
if (!cell.value) return false;
}
}
return true;
}
// Handle win
function handleWin() {
clearInterval(timer);
// Update stats
gamesPlayed++;
gamesWon++;
if (bestTime === null || seconds < bestTime) {
bestTime = seconds;
}
updateStats();
alert(`Congratulations! You solved the puzzle in ${timeDisplay.textContent}!`);
}
// Event listeners
numberButtons.forEach(btn => {
btn.addEventListener('click', () => {
// Clear active state from all buttons
numberButtons.forEach(b => b.classList.remove('active'));
// Set active state on clicked button
btn.classList.add('active');
// Update selected number
selectedNumber = btn.dataset.number;
// If a cell is selected, fill it
if (selectedCell && !selectedCell.classList.contains('prefilled')) {
selectedCell.value = selectedNumber;
selectedCell.dispatchEvent(new Event('input'));
// Check if the puzzle is complete
if (isPuzzleComplete()) {
setTimeout(() => {
if (checkSolution()) {
handleWin();
}
}, 100);
}
}
});
});
difficultyButtons.forEach(btn => {
btn.addEventListener('click', () => {
// Clear active state from all buttons
difficultyButtons.forEach(b => b.classList.remove('active'));
// Set active state on clicked button
btn.classList.add('active');
// Update difficulty
difficulty = btn.dataset.difficulty;
});
});
newGameBtn.addEventListener('click', () => {
gamesPlayed++;
updateStats();
initGame();
});
checkBtn.addEventListener('click', () => {
if (checkSolution()) {
handleWin();
}
});
hintBtn.addEventListener('click', giveHint);
solveBtn.addEventListener('click', solvePuzzle);
// Initialize the game
initGame();
</script>
<p style="border-radius: 8px; text-align: center; font-size: 12px; color: #fff; margin-top: 16px;position: fixed; left: 8px; bottom: 8px; z-index: 10; background: rgba(0, 0, 0, 0.8); padding: 4px 8px;">Made with <img src="https://enzostvs-deepsite.hf.space/logo.svg" alt="DeepSite Logo" style="width: 16px; height: 16px; vertical-align: middle;display:inline-block;margin-right:3px;filter:brightness(0) invert(1);"><a href="https://enzostvs-deepsite.hf.space" style="color: #fff;text-decoration: underline;" target="_blank" >DeepSite</a> - <a href="https://enzostvs-deepsite.hf.space?remix=sekopst/sudoku1" style="color: #fff;text-decoration: underline;" target="_blank" >🧬 Remix</a></p></body>
</html>