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HTML 

              
                <html>
  <link href="https://fonts.googleapis.com/css?family=Rye" rel="stylesheet">
<body onkeyup="start(event)"><h1><b>2048 Game</b></h1><div id="score"></div><button onClick="newGame()">New Game</button><br><br>
        <div class="grid-container">
      <div class="grid-row">
        <div class="grid-cell" id="1" ></div>
        <div class="grid-cell" id="2"></div>
        <div class="grid-cell" id="3"></div>
        <div class="grid-cell" id="4"></div>
      </div>
      <div class="grid-row">
        <div class="grid-cell" id="5"></div>
        <div class="grid-cell" id="6"></div>
        <div class="grid-cell" id="7"></div>
        <div class="grid-cell" id="8"></div>
      </div>
      <div class="grid-row">
        <div class="grid-cell" id="9"></div>
        <div class="grid-cell" id="10"></div>
        <div class="grid-cell" id="11"></div>
        <div class="grid-cell" id="12"></div>
      </div>
      <div class="grid-row">
        <div class="grid-cell" id="13"></div>
        <div class="grid-cell" id="14"></div>
        <div class="grid-cell" id="15"></div>
        <div class="grid-cell" id="16"></div>
      </div>
    </div>
</body>
</html>
!

CSS 

              
                .grid-cell {
  width: 75px;
  height: 75px;
  margin-right: 15px;
  float: left;
  position:relative;
  background:#d3d3d3;
  box-shadow:0px 0px 0px 10px #A9A9A9; 
  text-align:center; 
  padding:50px;
}
.grid-row {
  margin-bottom:15px;
  height:100px;
  width:800px;
  }
p
{
  margin-top:40px
}
.grid-container
{
  height:450px;
  width:450px;
  border:10px inset #d3d3d3;
  font-size:40px;
}
h1
{
  font-size:60px;
  font-family: 'Rye', cursive;
}
span{
 
}
button
{
  height:40px;
  width:150px;
  font-family: 'Rye', cursive;
  font-size:20px;
  font-weight:bold;
  float:left;
  margin-left:340px;
  margin-top:-20px;
}
button:hover
{
  cursor:pointer;
  background:#0C090A;
  color:white  
}
#score
{
 
  width:75px;
  background-color:#d3d3d3;
  padding:20px;
  font-size:25px;
  margin:10px 0px -30px 200px ;
  text-align:center;
}

body 
{
  margin:0% 50% 0% 25%;
}
!

JS 

              
                //random function
var id1;var list1;var list1Left=[];var score=0; var check;
random();random();
function random() { 
     document.getElementById("score").innerHTML= score;
    id1 = Math.ceil(Math.random() * 16);
    var a = document.getElementById(id1).innerText;
    if (a == "") {
        document.getElementById(id1).innerText = "2";
        document.getElementById(id1).style.background="#F0FFFF"
    } else {
        random();
    }
}
//--------------------------------------------------------------------------------------------------------------------------------------------------------
//take value function
function list2() {
    list1 = [[],[],[],[]];
    for (i = 1; i <= 16; i++) {
        var key = Math.ceil(i / 4);
        list1[key - 1].push(document.getElementById(i).innerHTML);
    }
    return list1;
}
//----------------------------------------------------------------------------------------------------------------------------------------------------
//moveing function
function wrappedMoveNumber(conditionArray1, conditionArray2, cb,count){
  var number = [0,1,2,3];
  number.forEach(function(){
    conditionArray1.forEach(function(k){
      conditionArray2.forEach(function(i){
          cb(i,k);
      })
    })
  })  
 if (count==1){
 if(cb==left_arrow)
    {
       wrappedAddNumber(addObj.left.k,addObj.left.i,leftAdd);
    }
  else if(cb==down_arrow)
     {
       wrappedAddNumber(addObj.right.k,addObj.right.i,downAdd);
     }
  else if(cb==up_arrow)  
     {
        wrappedAddNumber(addObj.left.k,addObj.left.i,upAdd);
     }                                          
 else if (cb==right_arrow)
    {
      wrappedAddNumber(addObj.right.k,addObj.right.i,rightAdd);
    }

}  else if(count==2)
      {
       printing(list1);
       random();lose_Check();
      }
}
function up_arrow(i,k)
{
  if (list1[i][k] === "") 
  {
   list1[i][k] = list1[i+1][k];
   list1[i+1][k] = "";
   }
}
function down_arrow(i,k)
{  
   if (list1[i][k] === "")
   {
     list1[i][k] = list1[i-1][k];
     list1[i-1][k] = "";
   }
}
function left_arrow(i,k)
{ 
  if (list1[k][i] === "") 
  {
    list1[k][i] = list1[k][i+1];
    list1[k][i+1] = "";
  }
}
function right_arrow(i,k)
{ 
   if (list1[k][i] === "")
   {
     list1[k][i] = list1[k][i-1];
     list1[k][i-1] = "";
   } 
}
//----------------------------------------------------------------------------------------------------------------------------------------------------
var moveObj={
    left:{
      i:[0,1,2],
      k:[0,1,2,3] },
  right:{
    i:[3,2,1],
    k:[0,1,2,3] },
  up:{
    i:[0,1,2],
    k:[0,1,2,3]},
  down:{
    i:[3,2,1],
    k:[3,2,1,0] }   
}
var addObj={
  left:{
    i:[1,2,3],
    k:[0,1,2,3]},
  right:{
    i:[3,2,1],
    k:[3,2,1,0]},  
  }
var colour={
  0:"#d3d3d3",
  2:"#F0FFFF",
  4:"#FFE4C4",
  8:"#FFA500",
  16:"#FFA07A",
  32:"#FF7F50",
  64:"#FF0000",
  128:"#ffff99",
  256:"#ffff66",
  512:"#FFFF00",
  1024:" #e6e600",
  2048:"#FFD700"
}
//--------------------------------------------------------------------------------------------------------------------------------------------------------
//start function
function start(event)
{
  var key_value=event.keyCode;list2();console.log(score);
  if (key_value===37)
      {
      //left
        wrappedMoveNumber(moveObj.left.k,moveObj.left.i,left_arrow,1);
        
      }
  else if (key_value===38)
      {
      //up        
        
        wrappedMoveNumber(moveObj.up.k,moveObj.up.i,up_arrow,1);
      }
  else if (key_value===39)
      {
      //right
        wrappedMoveNumber(moveObj.right.k,moveObj.right.i,right_arrow,1);
      }
  else if (key_value===40)
      {
      //down
        wrappedMoveNumber(moveObj.down.k,moveObj.down.i,down_arrow,1);
      }
}
//---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//add function
function wrappedAddNumber(conditionArray3, conditionArray4,callback)
{
  conditionArray3.forEach(function(k){
      conditionArray4.forEach(function(i){
          callback(k,i);
      })
    })
     
   if(callback==leftAdd)
    { 
       wrappedMoveNumber(moveObj.left.k,moveObj.left.i,left_arrow,2);
    }
  else if(callback==downAdd)
     {
       wrappedMoveNumber(moveObj.down.k,moveObj.down.i,down_arrow,2);
     }
  else if(callback==upAdd)  
     {
        wrappedMoveNumber(moveObj.up.k,moveObj.up.i,up_arrow,2);
     }                                          
 else if (callback==rightAdd)
    {
      wrappedMoveNumber(moveObj.right.k,moveObj.right.i,right_arrow,2);
    }
}
function upAdd(k,i)
{
   if (list1[i-1][k]==list1[i][k])
     {
       list1[i-1][k]=Number(list1[i-1][k])+Number(list1[i][k]);
       score +=Number(list1[i-1][k]);
       list1[i][k]="";
     }
}
function downAdd(k,i)
{
  if (list1[i-1][k]==list1[i][k])
     {
       list1[i][k]=Number(list1[i-1][k])+Number(list1[i][k]);
      score +=Number(list1[i][k]);
       list1[i-1][k]="";
     }
}

function leftAdd(k,i)
{ 
  if (list1[k][i]===list1[k][i-1])
      {
        list1[k][i]=Number(list1[k][i-1])+Number(list1[k][i-1]);
        score +=Number(list1[i][k]);
        list1[k][i-1]="";
      }
}
function rightAdd(k,i)
{
  
   if (list1[k][i]===list1[k][i-1])
      {
        list1[k][i-1]=Number(list1[k][i-1])+Number(list1[k][i]);
        score +=Number(list1[i-1][k]);
        list1[k][i]="";
      }
}
//---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//printing  function
function printing(list)
{ 
  for (var x=0,y=1;x<4;x++)
    {
      for(var z=0;z<4;z++)
        {if(list[x][z]==0)
          {
            list[x][z]="";
          }
          document.getElementById(y).innerText=list[x][z];
          var colors=Number(list[x][z])%2048;
         document.getElementById(y).setAttribute("style","background-color:"+colour[colors]+";text-align:center;")
           y++;
        }
    }
}
//--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//lose function
function lose_Check()
 {
  stop: for (var i=0;i<4;i++)
     {
       for (var j=0;j<3;j++)
         {
           if (list1[i][j]==list1[i][j+1] || list1[i][j]==list1[i+1][j])
             {
                check=true;
	            	break stop;
             }
           else
             {
               check=false;
    		
             }
         }
     }
    if (check!==true)

	{
         alert("Game Over");   
	}
 }
//-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
//new game function
function newGame()
{ 
  for (var i = 1; i <= 16; i++)
    {
      document.getElementById(i).innerText = "";
      document.getElementById(i).setAttribute("style","background:'#d3d3d3';box-shadow:0px 0px 0px 10px #A9A9A9;")
    }score=0;
    random();
    random();
}
//--------------------------------------------------------------------------------------------------------------------------------------------
!
999px

Console