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HTML 

              
                <html>
	<head>
		<title>2048 Game</title>
		<link href="https://fonts.googleapis.com/css?family=Oxygen" rel="stylesheet" type="text/css">
		<link rel="stylesheet" href="style.css">
		<script src="main.js"></script>
	</head>
	<body>
		<header>
			<h1>2048</h1>
		</header>
		<main>
			<div class="grid-container">
				<div id="0" class="grid-item"></div>
				<div id="1" class="grid-item"></div>
				<div id="2" class="grid-item"></div>
				<div id="3" class="grid-item"></div>
				<div id="4" class="grid-item"></div>
				<div id="5" class="grid-item"></div>
				<div id="6" class="grid-item"></div>
				<div id="7" class="grid-item"></div>
				<div id="8" class="grid-item"></div>
				<div id="9" class="grid-item"></div>
				<div id="10" class="grid-item"></div>
				<div id="11" class="grid-item"></div>
				<div id="12" class="grid-item"></div>
				<div id="13" class="grid-item"></div>
				<div id="14" class="grid-item"></div>
				<div id="15" class="grid-item"></div>
			</div>
			<div class="info">
				<button type="button" onclick="gameInitialization()">New Game</button>
			</div>
			<div class="info">
				<p id="score">Current Score: 0</p>
				<p id="high-score">High Score: 0</p>
			</div>
		</main>
	</body>
</html>
!

CSS 

              
                body{
	background-color: #F3DB6C;
	font-family: "Oxygen",monospace;

}

h1{
	text-align: center;
	font-size: 5.3em;
	margin: 0px;
}

.grid-container{
	display:grid;
	grid-template-columns: 100px 100px 100px 100px;
	grid-template-rows: 100px 100px 100px 100px;
	grid-gap:2px;
	justify-content: center;
}

.grid-item{
	border-radius: 20px;
	text-align: center;
	vertical-align: middle;
	line-height: 90px;
	border:5px solid black;
	background-color: white;
	font-size: 5em;
	color: white;
	transition: transform 1s;
}

.info{
	text-align: center;
}

button{
	background-color: #FF6150;
	border: none;
	color: white;
	padding: 7px 15px;
	text-align: center;
	display: inline-block;
	font-size: 25px;
	margin: 13px 2px 0px;
	cursor: pointer;
}

p{
	background-color: grey;
	border:3px solid black;
	display: inline-block;
	color: white;
	padding: 5px 10px;
	text-align: center;
	display: inline-block;
	font-size: 15px;
	margin: 15px 40px 0px;
}


.grid-item:hover {
  /*transform: translate(101px, 0px);*/
}
!

JS 

              
                var scores={currentScore:0,high:0};

function getRandom(numbers){
	var x =(Math.floor(Math.random() * 16)).toString();
	while (numbers[x].value!==0){
		x =(Math.floor(Math.random() * 16)).toString();
	}
	return x;
}

function gameInitialization(){
	if(scores.currentScore>scores.high){
		scores.high=scores.currentScore;
	}
	scores.currentScore=0;
	var numbers = [];
	var i;
	for(i=0;i<16;i++){
		numbers[i]={value:0,match:false};
	}
	var x=getRandom(numbers);
	numbers[x].value=2;
	var y=getRandom(numbers);
	numbers[y].value=2;

	displayBoard(numbers);
	//document.getElementById("1").style.transform = "translate(102px, 0px)";//ADD use concatenation

}

function getNumbers(){
	var i,j,current;
    var numbers=[];
	for(i=0;i<16;i++){
		j=document.getElementById(i).innerHTML;
		if(j===""){
			current={value:0,match:false};
			numbers[i]=current;	
		}
		else{
			current={value:j,match:false};
			numbers[i]=current;
		}

	}
	return numbers;
}

function addTile(numbers){
	var rand=getRandom(numbers);
	numbers[rand].value=2;
	displayBoard(numbers);
}

function pressRight(){

	var numbers=getNumbers();
	var moves=[];// ADD
	var currentMove=[];//ADD
	var move=false;
	var i,j,current;
	for(i=0;i<4;i++){
		for(j=0;j<3;j++){
			current=(i*4)+2-j;
			if(numbers[current].value===0){
				//skip
			}
			else{
				currentMove=[];
				currentMove.push(current);//ADD
				while((current<((i*4)+3)) && numbers[current+1].value===0){
					numbers[current+1].value=numbers[current].value;
					numbers[current].value=0;
					current++;
					move=true;
				}

				if(current==15 || current==3 || current ==7 || current==11){ // Check if at the end of a row
					//skip
				}
				else if(numbers[current+1].match){
					//also skip
				}
				else{
					if(numbers[current].value==numbers[current+1].value){
						scores.currentScore+=2*numbers[current].value;
						numbers[current].value=0;
						numbers[current+1].value=2*numbers[current+1].value;
						numbers[current+1].match=true;
						move=true;
						current=current+1; //ADD
					}

				if(move){ //ADD
					currentMove.push(current);
					moves.push(currentMove);
					}
				}

			}
		}
	}
	if(move){
		addTile(numbers);
	}
	
}

function pressLeft(){
	var numbers=getNumbers();
	var move=false;
	var i,j,current;
	for(i=0;i<4;i++){
		for(j=0;j<3;j++){
			current=(i*4)+1+j;
			if(numbers[current].value===0){
				//skip
			}
			else{
				while((current>(i*4)) && numbers[current-1].value===0){
					numbers[current-1].value=numbers[current].value;
					numbers[current].value=0;
					current--;
					move=true;
				}
				if(current===0 || current==4 || current==8 || current==12){ // Check if at the end of a row
					//skip
				}
				else if(numbers[current-1].match){
					//also skip
				}
				else{
					if(numbers[current].value==numbers[current-1].value){
						scores.currentScore+=2*numbers[current].value;	
						numbers[current].value=0;
						numbers[current-1].value=2*numbers[current-1].value;
						numbers[current-1].match=true;
						move=true;
					}
				}

			}
		}
	}

	if(move){
		addTile(numbers);
	}
}

function pressUp(){
	var numbers=getNumbers();
	var move=false;
	var i,j,current;
	for(i=1;i<4;i++){
		for(j=0;j<4;j++){
			current=(i*4)+j;
			if(numbers[current].value===0){
				//skip
			}
			else{
				while(current>j && numbers[current-4].value===0){
					numbers[current-4].value=numbers[current].value;
					numbers[current].value=0;
					current-=4;
					move=true;
				}
				if(current===0 || current==1 || current==2 || current==3){ // Check if at the end of a row
					//skip
				}
				else if(numbers[current-4].match){
					//also skip
				}
				else{
					if(numbers[current].value==numbers[current-4].value){
						scores.currentScore+=2*numbers[current].value;	
						numbers[current].value=0;
						numbers[current-4].value=2*numbers[current-4].value;
						numbers[current-4].match=true;
						move=true;
					}
				}

			}
		}
	}

	if(move){
		addTile(numbers);
	}
}

function pressDown(){
	var numbers=getNumbers();
	var move=false;
	var i,j,current;
	for(i=2;i>-1;i--){
		for(j=0;j<4;j++){
			current=(i*4)+j;
			if(numbers[current].value===0){
				//skip
			}
			else{
				while(current<(12+j) && numbers[current+4].value===0){
					numbers[current+4].value=numbers[current].value;
					numbers[current].value=0;
					current+=4;
					move=true;
				}
				if(current==12 || current==13 || current==14 || current==15){ // Check if at the end of a row
					//skip
				}
				else if(numbers[current+4].match){
					//also skip
				}
				else{
					if(numbers[current].value==numbers[current+4].value){
						scores.currentScore+=2*numbers[current].value;	
						numbers[current].value=0;
						numbers[current+4].value=2*numbers[current+4].value;
						numbers[current+4].match=true;
						move=true;
					}
				}

			}
		}
	}

	if(move){
		addTile(numbers);
	}
}

function displayBoard(numbers){
	var i;
	for(i=0;i<16;i++){
		if(numbers[i].value===0){
			document.getElementById(i).innerHTML="";
		}
		else{
			document.getElementById(i).innerHTML=numbers[i].value.toString();
		}
		switch(numbers[i].value.toString()){
			case "0":
				document.getElementById(i).style.backgroundColor= "#FFFFFF";
				document.getElementById(i).style.fontSize= "5em";
				break;
			case "2":
				document.getElementById(i).style.backgroundColor= "#8DAB00";
				document.getElementById(i).style.fontSize= "5em";
				break;
			case "4":
				document.getElementById(i).style.backgroundColor= "#50B4FF";
				document.getElementById(i).style.fontSize= "5em";
				break;
			case "8":
				document.getElementById(i).style.backgroundColor= "#6609B4";
				document.getElementById(i).style.fontSize= "5em";
				break;
			case "16":
				document.getElementById(i).style.backgroundColor= "#00009E";
				document.getElementById(i).style.fontSize= "4.5em";
				break;
			case "32":
				document.getElementById(i).style.backgroundColor= "#A70075";
				document.getElementById(i).style.fontSize= "4.5em";
				break;
			case "64":
				document.getElementById(i).style.backgroundColor= "#A70000";
				document.getElementById(i).style.fontSize= "4.5em";
				break;
			case "128":
				document.getElementById(i).style.backgroundColor= "#A74A00";
				document.getElementById(i).style.fontSize= "3.5em";
				break;
			case "256":
				document.getElementById(i).style.backgroundColor= "#053C4B";
				document.getElementById(i).style.fontSize= "3em";
				break;
			case "512":
				document.getElementById(i).style.backgroundColor= "#384B0E";
				document.getElementById(i).style.fontSize= "3.5em";
				break;
			case "1024":
				document.getElementById(i).style.backgroundColor= "#4B220E";
				document.getElementById(i).style.fontSize= "2.5em";
				break;
			case "2048":
				document.getElementById(i).style.backgroundColor= "#606161";
				document.getElementById(i).style.fontSize= "2.2em";
				break;	
		}
		if(scores.currentScore>scores.high){
			scores.high=scores.currentScore;
		}
		document.getElementById("score").innerHTML="Current Score: "+scores.currentScore;
		document.getElementById("high-score").innerHTML="High Score: "+scores.high;

	}
}

document.addEventListener('keydown', function(event) {
    if(event.keyCode == 37) {
       pressLeft();
       event.preventDefault();
    }
    else if(event.keyCode == 39) {
       pressRight();
       event.preventDefault();
    }
    else if(event.keyCode == 38){
    	event.preventDefault();
      	pressUp();
    }
    else if(event.keyCode == 40){
    	event.preventDefault();
    	pressDown();
    }
});



/*
possible idea for animation: save a tuple of move between ids ie. (beginTile,endTile),(1,4),(2,3)....etc
Then during display board, animate between the tuples
*/
!
999px

Console