function newgame() {
 moves = 0;
    document.getElementById("moves").innerHTML = "Moves: "+moves;

  for (var i = 0; i < 25; i++) {
   if (Math.random() >= 0.5) {
$(document.getElementsByClassName('block')[i]).toggleClass("b1 b2")
   }
}
}
newgame();
function toggle(a,b) {  
  moves += 1;
  document.getElementById("moves").innerHTML = "Moves: "+moves;
$(document.getElementsByClassName('block')[a+(b*5)]).toggleClass("b1 b2");

if (a<4) {$(document.getElementsByClassName('block')[(a+1)+(b*5)]).toggleClass("b1 b2")}
  
  
if (a>0) {$(document.getElementsByClassName('block')[(a-1)+(b*5)]).toggleClass("b1 b2")}
  
  
if (b<4) {$(document.getElementsByClassName('block')[a+((b+1)*5)]).toggleClass("b1 b2")}
  
if (b>0) {$(document.getElementsByClassName('block')[a+((b-1)*5)]).toggleClass("b1 b2")}
}

body {
  background-color: #000000;
}

.game {
  float: left;
  background-color: #000000;
  width: 300px;
  height: 300px;
  overflow: hidden;
  overflow-x: hidden;
  user-select: none;
  display: inline-block;
}

.container {
  border-color: #ffffff;
  border-width: 5px;
  border-style: solid;
  border-radius: 5px;
  width: 600px;
  height: 300px;
  text-align: center;
}

.side {
  float: left;
  background-color: #000000;
  width: 300px;
  height: 300px;
  overflow: hidden;
  overflow-x: hidden;
  user-select: none;
  display: inline-block;
}

.block {
  transition: background-color 0.2s;
  float: left;
}

.b1:hover {
  background-color: #444444;
  cursor: pointer;
}

.b2:hover {
  background-color: #bbbbbb;
  cursor: pointer;
}

.row {
  width: 300px;
  overflow: auto;
  overflow-x: hidden;
}

.b1 {
  display: inline-block;
  height: 50px;
  width: 50px;
  background-color: #000000;
  border-color: #000000;
  border-width: 5px;
  border-style: solid;
}




.b2 {
  display: inline-block;
  height: 50px;
  width: 50px;
  background-color: #ffffff;
  border-color: #000000;
  border-width: 5px;
  border-style: solid;
}



.title {
  width: 200px;
  height: 50px;
  color: #ffffff;
  font-size: 55px;
  font-weight: bold;
  font-family: Arial;
  display: table-cell;
  vertical-align: middle;
}

.button {
  cursor: pointer;
  width: 200px;
  height: 50px;
  background-color: #000000;
  border-color: #ffffff;
  border-style: solid;
  border-width: 5px;
  color: #ffffff;
  font-size: 25px;
  font-weight: bold;
  font-family: Arial;
  display: table-cell;
  vertical-align: middle;
  border-radius: 5px;
  transition: background-color 0.3s, color 0.3s;
}

.button:hover {
  background-color: #ffffff;
  color: #000000;
}

.sidetable {
  padding: 30px 0px;
  height: 200px;
}


#moves {
  width: 200px;
  height: 50px;
  color: #aaaaaa;
  font-size: 30px;
  font-weight: bold;
  font-family: Arial;
  display: table-cell;
  vertical-align: middle;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<center>
  <div class="container">
  
  
  <div class="game"><div class="row"><div onclick="toggle(0,0);" class="block b1"></div><div onclick="toggle(1,0);" class="block b1"></div><div onclick="toggle(2,0);" class="block b1"></div><div onclick="toggle(3,0);" class="block b1"></div><div onclick="toggle(4,0);" class="block b1"></div></div><div class="row"><div onclick="toggle(0,1);" class="block b1"></div><div onclick="toggle(1,1);" class="block b1"></div><div onclick="toggle(2,1);" class="block b1"></div><div onclick="toggle(3,1);" class="block b1"></div><div onclick="toggle(4,1);" class="block b1"></div></div><div class="row"><div onclick="toggle(0,2);" class="block b1"></div><div onclick="toggle(1,2);" class="block b1"></div><div onclick="toggle(2,2);" class="block b1"></div><div onclick="toggle(3,2);" class="block b1"></div><div onclick="toggle(4,2);" class="block b1"></div></div><div class="row"><div onclick="toggle(0,3);" class="block b1"></div><div onclick="toggle(1,3);" class="block b1"></div><div onclick="toggle(2,3);" class="block b1"></div><div onclick="toggle(3,3);" class="block b1"></div><div onclick="toggle(4,3);" class="block b1"></div></div><div class="row"><div onclick="toggle(0,4);" class="block b1"></div><div onclick="toggle(1,4);" class="block b1"></div><div onclick="toggle(2,4);" class="block b1"></div><div onclick="toggle(3,4);" class="block b1"></div><div onclick="toggle(4,4);" class="block b1"></div></div></div>
    
    <div class="side">
      <center class="sidetable">
        <div class="title">Tiles</div>
        <br>
        <div class="button" onclick="newgame()">New Game</div>
        <br><br>
        <div id="moves">Moves: 0</div>
      </center>
    </div>
    
  </div>
    </center>