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227 | <!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Sliding Puzzle Game</title>
<style>
body {
font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
background: #222;
color: white;
display: flex;
flex-direction: column;
align-items: center;
height: 100vh;
margin: 0;
justify-content: center;
}
h1 {
margin-bottom: 20px;
}
#puzzle {
display: grid;
grid-template-columns: repeat(4, 80px);
grid-template-rows: repeat(4, 80px);
gap: 5px;
}
.tile {
display: flex;
justify-content: center;
align-items: center;
background: #61dafb;
color: #222;
font-weight: bold;
font-size: 1.5rem;
border-radius: 8px;
cursor: pointer;
user-select: none;
transition: background 0.3s;
}
.tile.empty {
background: transparent;
cursor: default;
}
.tile:hover:not(.empty) {
background: #21a1f1;
}
#message {
margin-top: 20px;
font-size: 1.2rem;
min-height: 1.5em;
}
button {
margin-top: 20px;
padding: 10px 20px;
font-size: 1rem;
border: none;
border-radius: 5px;
background: #61dafb;
color: #222;
font-weight: bold;
cursor: pointer;
transition: background 0.3s;
}
button:hover {
background: #21a1f1;
}
</style>
</head>
<body>
<h1>Sliding Puzzle Game</h1>
<div id="puzzle"></div>
<div id="message"></div>
<button id="shuffleBtn">Shuffle & Start</button>
<script>
const puzzle = document.getElementById('puzzle');
const message = document.getElementById('message');
const shuffleBtn = document.getElementById('shuffleBtn');
let tiles = [];
const size = 4; // 4x4 grid
let emptyPos = size * size - 1; // start empty tile at last position
let isPlaying = false;
// Initialize tiles in order
function init() {
tiles = [];
puzzle.innerHTML = '';
for (let i = 0; i < size * size; i++) {
tiles[i] = i;
const tile = document.createElement('div');
tile.classList.add('tile');
if (i === emptyPos) {
tile.classList.add('empty');
tile.textContent = '';
} else {
tile.textContent = i + 1;
}
tile.setAttribute('data-index', i);
tile.addEventListener('click', () => {
if (!isPlaying) return;
moveTile(i);
});
puzzle.appendChild(tile);
}
message.textContent = "Click 'Shuffle & Start' to play!";
}
// Swap two tiles in the array and update the DOM
function swapTiles(i, j) {
[tiles[i], tiles[j]] = [tiles[j], tiles[i]];
updateTiles();
}
// Update tile DOM to reflect current tiles array
function updateTiles() {
tiles.forEach((value, i) => {
const tile = puzzle.children[i];
if (value === emptyPos) {
tile.classList.add('empty');
tile.textContent = '';
tile.style.cursor = 'default';
} else {
tile.classList.remove('empty');
tile.textContent = value + 1;
tile.style.cursor = 'pointer';
}
});
}
// Check if tile at index can move (if adjacent to empty)
function canMove(index) {
const row = Math.floor(index / size);
const col = index % size;
const emptyRow = Math.floor(tiles.indexOf(emptyPos) / size);
const emptyCol = tiles.indexOf(emptyPos) % size;
// Check if tile is next to empty tile (up/down/left/right)
return (
(row === emptyRow && Math.abs(col - emptyCol) === 1) ||
(col === emptyCol && Math.abs(row - emptyRow) === 1)
);
}
// Move tile if possible
function moveTile(index) {
if (canMove(index)) {
const emptyIndex = tiles.indexOf(emptyPos);
swapTiles(index, emptyIndex);
if (checkWin()) {
message.textContent = "🎉 Congratulations! You solved the puzzle!";
isPlaying = false;
}
}
}
// Shuffle tiles randomly using Fisher-Yates shuffle and check solvability
function shuffle() {
do {
for (let i = tiles.length - 2; i > 0; i--) {
const j = Math.floor(Math.random() * (i + 1));
[tiles[i], tiles[j]] = [tiles[j], tiles[i]];
}
} while (!isSolvable(tiles));
updateTiles();
message.textContent = "Game started! Arrange the tiles.";
isPlaying = true;
}
// Check if puzzle is solved
function checkWin() {
for (let i = 0; i < tiles.length - 1; i++) {
if (tiles[i] !== i) return false;
}
return true;
}
// Count inversions for solvability check
function countInversions(arr) {
let inversions = 0;
for (let i = 0; i < arr.length - 1; i++) {
for (let j = i + 1; j < arr.length; j++) {
if (arr[i] !== emptyPos && arr[j] !== emptyPos && arr[i] > arr[j]) {
inversions++;
}
}
}
return inversions;
}
// Check if current puzzle configuration is solvable
function isSolvable(arr) {
const inversions = countInversions(arr);
const emptyRow = Math.floor(arr.indexOf(emptyPos) / size);
// For even grid width (4), puzzle is solvable if:
// - empty on even row from bottom and inversions odd
// - empty on odd row from bottom and inversions even
if (size % 2 === 0) {
const emptyRowFromBottom = size - emptyRow;
if ((emptyRowFromBottom % 2 === 0) === (inversions % 2 === 1)) {
return true;
} else {
return false;
}
} else {
// Odd grid width: inversions must be even
return inversions % 2 === 0;
}
}
shuffleBtn.addEventListener('click', () => {
shuffle();
});
init();
</script>
</body>
</html>
|
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