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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

            
              <div class="puzzle">
	<div class="heading">
		<span>
			<sub>★</sub> <sup>☆</sup> <sub>★</sub> <sup>☆</sup> <sub>★</sub> <sup>☆</sup> <sub>★</sub>
		</span>
		<h2>Simpleweb</h2>
		<span>
			<sup>★</sup> <sub>☆</sub> <sup>★</sup> <sub>☆</sub> <sup>★</sup> <sub>☆</sub> <sup>★</sup>
		</span>
	</div>
	<div class="answer"></div>
	<div class="grid">
		<button class="tile tile--1" style="--area:A"></button>
		<button class="tile tile--2" style="--area:B"></button>
		<button class="tile tile--3" style="--area:C"></button>
		<button class="tile tile--4" style="--area:D"></button>
		<button class="tile tile--5" style="--area:E"></button>
		<button class="tile tile--6" style="--area:F"></button>
		<button class="tile tile--7" style="--area:G"></button>
		<button class="tile tile--8" style="--area:H"></button>
		<div class="tile tile--empty" style="--area:I"></div>
	</div>
</div>

<p>Check out <a target="_blank" href="https://simpleweb.co.uk/coding-a-festive-puzzle-game-with-modern-front-end-techniques/">my write-up on the Simpleweb blog!</a></p>
            
          
!
            
              * {
	box-sizing: border-box;
}

body {
	display: grid;
	place-items: center;
	height: 100vh;
	background: #111;
	color: #fefefe;
	font-family: 'Fontdiner Swanky', cursive;
	-webkit-font-smoothing: antialiased;
}

p {
	font-family: Helvetica, Arial, sans-serif;
}

.puzzle {
	background: linear-gradient(hsl(360, 98%, 36%), hsl(360, 92%, 42%)), url(https://www.toptal.com/designers/subtlepatterns/patterns/white_plaster.png);
	background-blend-mode: multiply;
	width: 90vw;
	max-width: 400px;
	box-shadow:
		0 .25em 1em 0 rgba(0,0,0,0.30),
		inset .25em .25em 1em 0 hsl(360, 88%, 72%),
		inset .15em .15em .2em 0 hsl(360, 88%, 72%),
		inset -.25em -.25em 1em 0 hsl(360, 88%, 22%),
		inset -.15em -.15em .2em 0 hsl(360, 88%, 2%);
	border-radius: 1.2em;
	padding: 1.4em;
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	grid-gap: .5em;
	position: relative;
	overflow: hidden;
}

.puzzle::after {
	content: '';
	position: absolute;
	top: 0;
	left: 0;
	right: 0;
	height: 40%;
	transform: rotate(-15deg) scale(2);
	background: linear-gradient(rgba(255,255,255,0.05), rgba(255,255,255,0.12));
}

.puzzle > * {
	z-index: 1;
}

.grid {
	border: 2px solid hsl(360, 98%, 12%);
	grid-column-end: span 3;
	display: grid;
	grid-gap: 2px;
	grid-template-areas:
		"A B C"
		"D E F"
		"G H I";
	background: hsl(360, 98%, 12%);
	box-shadow:
		inset 0 0 2em 0 hsl(360, 98%, 2%);
}

.tile,
.answer {
	height: 0;
	padding-bottom: 100%;
	grid-area: var(--area, auto);
	border: none;
	background: url(https://source.unsplash.com/900x900/?christmas,holiday,festive);
	background-size: 300%;
}

.tile {
	cursor: pointer;
}

.tile--empty {
	cursor: auto;
}

.tile:focus {
	outline: 2px solid hsl(360, 98%, 42%);
}

.tile[disabled] {
	cursor: not-allowed;
}

.answer {
	grid-column-end: span 1;
	width: 100%;
	justify-self: flex-end;
	background-size: 100%;
	box-shadow:
		inset 0 0 0 .2em hsl(360, 90%, 26%);
}

.tile--empty { background: transparent; }
.tile--1 { background-position: top left; }
.tile--2 { background-position: top center; }
.tile--3 { background-position: top right; }
.tile--4 { background-position: center left; }
.tile--5 { background-position: center; }
.tile--6 { background-position: center right; }
.tile--7 { background-position: bottom left; }
.tile--8 { background-position: bottom center; }

h2 {
	margin: 0;
	font-size: 1.8em;
}

.heading span {
	font-size: 1em;
	line-height: 2.4em;
}

.heading {
	align-self: center;
	grid-column-end: span 2;
	text-align: center;
	text-shadow: 0 -1px 0 hsl(360, 90%, 26%);
	transform: skew(-10deg) rotate(-6deg);
}

@keyframes popIn {
	from {
		opacity: 0;
		pointer-events: none;
		visibility: hidden;
		transform: scale(0.6);
		transition: opacity, scale, 600ms cubic-bezier(0.68, -0.55, 0.265, 1.55);
	}
}

p {
	padding: 0 1em;
	text-align: center;
}

a {
	color: white;
}
            
          
!
            
              // Initiate CSS Grid animation tool
const grid = document.querySelector(".grid");
const { forceGridAnimation } = animateCSSGrid.wrapGrid(grid);

// Get all the tiles and the empty tile
const tiles = Array.from(document.querySelectorAll(".tile"));
const emptyTile = document.querySelector(".tile--empty");

// Get congratulations heading
const heading = document.querySelector(".heading");

// A key / value store of what areas to "unlock"
const areaKeys = {
	A: ["B", "D"],
	B: ["A", "C", "E"],
	C: ["B", "F"],
	D: ["A", "E", "G"],
	E: ["B", "D", "F", "H"],
	F: ["C", "E", "I"],
	G: ["D", "H"],
	H: ["E", "G", "I"],
	I: ["F", "H"]
};

// Add click listener to all tiles
tiles.map(tile => {
	tile.addEventListener("click", event => {
		// Grab the grid area set on the clicked tile and empty tile
		const tileArea = tile.style.getPropertyValue("--area");
		const emptyTileArea = emptyTile.style.getPropertyValue("--area");

		// Swap the empty tile with the clicked tile
		emptyTile.style.setProperty("--area", tileArea);
		tile.style.setProperty("--area", emptyTileArea);

		// Animate the tiles
		forceGridAnimation();

		// Unlock and lock tiles
		unlockTiles(tileArea);
	});
});

// Unlock or lock tiles based on empty tile position
const unlockTiles = currentTileArea => {
	
	// Cycle through all the tiles and check which should be disabled and enabled
	tiles.map(tile => {
		const tileArea = tile.style.getPropertyValue("--area");

		// Check if that areaKey has the tiles area in it's values
		// .trim() is needed because the animation lib formats the styles attribute
		if (areaKeys[currentTileArea.trim()].includes(tileArea.trim())) {
			tile.disabled = false;
		} else {
			tile.disabled = true;
		}
	});

	// Check if the tiles are in the right order
	isComplete(tiles);
};


const isComplete = tiles => {
	
	// Get all the current tile area values
	const currentTilesString = tiles
		.map(tile => tile.style.getPropertyValue("--area").trim())
		.toString();

	// Compare the current tiles with the areaKeys keys
	if (currentTilesString == Object.keys(areaKeys).toString()) {
		heading.children[1].innerHTML = "You win!";
		heading.style = `
			animation: popIn .3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
		`;
	}
};


// Inversion calculator
const inversionCount = array => {
	
	// Using the reduce function to run through all items in the array
	// Each item in the array is checked against everything before it
	// This will return a new array with each intance of an item appearing before it's original predecessor
	return array.reduce((accumulator, current, index, array) => {
		return array
			.slice(index)
			.filter(item => {
				return item < current;
			})
			.map(item => {
				return [current, item];
			})
			.concat(accumulator);
	}, []).length;
};


// Randomise tiles
const shuffledKeys = keys => Object.keys(keys).sort(() => .5 - Math.random());

setTimeout(() => {

	// Begin with our in order area keys
	let startingAreas = Object.keys(areaKeys);
		
	// Use the inversion function to check if the keys will be solveable or not shuffled
	// Shuffle the keys until they are solvable
	while (inversionCount(startingAreas) % 2 == 1 || inversionCount(startingAreas) == 0) {
		startingAreas = shuffledKeys(areaKeys);
	}	

	// Apply shuffled areas
	tiles.map((tile, index) => {
		tile.style.setProperty("--area", startingAreas[index]);
	});

	// Initial shuffle animation
	forceGridAnimation();

	// Unlock and lock tiles
	unlockTiles(emptyTile.style.getPropertyValue("--area"));
}, 2000);

            
          
!
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