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HTML

              
                <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Memory Game</title>
    <script src="js/test.js"></script>
<link rel="stylesheet" href="css/style.css">
    <link href='https://fonts.googleapis.com/css?family=Oswald:400,700,300' rel='stylesheet' type='text/css'>


<script>
var memory_array = ["A", "A", "B", "B", "C", "C", "D", "D", "E", "E", "F", "F", "G", "G", "H", "H", "I", "I", "J", "J", "K", "K", "L", "L"];
var memory_values = [];
var memory_tile_ids = [];
var tiles_flipped = 0;

//shuffle method prototype
Array.prototype.memory_tile_shuffle = function () {
    var i = this.length, j, temp;
    while(--i > 0) {
        j = Math.floor(Math.random() * (i + 1));
        temp = this[j];
        this[j] = this[i];
        this[i] = temp;
    }
}//shuffle prototype ending

function newBoard() {
    tiles_flipped = 0;
    var output = '';
    memory_array.memory_tile_shuffle();
    for(var i = 0; i < memory_array.length; i++) {
        output += '<div id="tile_'+i+'" onclick="memoryFlipTile(this,\''+memory_array[i]+'\')"></div>';
    }//For loop ending
  document.getElementById('memory_board').innerHTML = output;
}//function end

function memoryFlipTile(tile,val){
    if(tile.innerHTML == "" && memory_values.length < 2){
        tile.style.background = '#FFF';
        tile.innerHTML = val;
        if(memory_values.length == 0){
            memory_values.push(val);
            memory_tile_ids.push(tile.id);
        } else if(memory_values.length == 1){
            memory_values.push(val);
            memory_tile_ids.push(tile.id);
            if(memory_values[0] == memory_values[1]){
                tiles_flipped += 2;
                // Clear both arrays
                memory_values = [];
                memory_tile_ids = [];
                // Check to see if the whole board is cleared
                if(tiles_flipped == memory_array.length){
                    alert("Board cleared... generating new board");
                    document.getElementById('memory_board').innerHTML = "";
                    newBoard();
                }
            } else {
                function flip2Back(){
                    // Flip the 2 tiles back over
                    var tile_1 = document.getElementById(memory_tile_ids[0]);
                    var tile_2 = document.getElementById(memory_tile_ids[1]);
                    tile_1.style.background = 'url(https://res.cloudinary.com/djangoles/image/upload/v1440691576/HARRY3_m8wcz6.jpg) no-repeat';
                    tile_1.innerHTML = "";
                    tile_2.style.background = 'url(https://res.cloudinary.com/djangoles/image/upload/v1440691576/HARRY3_m8wcz6.jpg) no-repeat';
                    tile_2.innerHTML = "";
                    // Clear both arrays
                    memory_values = [];
                    memory_tile_ids = [];
                }
                setTimeout(flip2Back, 700);
            }
        }
    }
}


</script>
</head>


<body>
  <div id = "mainHeading">
    <h1>Memory Game</h1>
    <h2>Match any 2 squares</h2>
  
  </div>
    <div id ="memory_board"></div>
    <script>newBoard();</script>







</body>
              
            
!

CSS

              
                #mainHeading {
text-align:center;
font-family: Oswald;
}
#mainHeading h1 {
font-size: 3.5em
}


div#memory_board {
    background: black;
    border: 6px solid rgba(100, 100, 100, .9);
    width:800px;
    height: 540px;
    padding: 24px;
    margin: 50px auto 0 auto;
  border: 5px solid rgba(200, 200, 200, .5);
border-radius: 50px;
box-shadow: 10px 10px 10px #888888;
border-top-width: 10px;
border-top-color: rgba(100,100,100, .9);
}

div#memory_board > div {
    background: url(https://res.cloudinary.com/djangoles/image/upload/v1440691576/HARRY3_m8wcz6.jpg) no-repeat;
    background-color:orange;
    border: white 1px solid;
    width: 71px;
    height: 71px;
    float: left;
    margin: 10px;
    padding: 20px;
    font-size: 64px;
    cursor: pointer;
    text-align: center;
}
              
            
!

JS

              
                
              
            
!
999px

Console