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HTML

              
                <div class="wrap">
<div class="wrap-in">
  <div class="rw">
    <div class="t-l inline push green unclickable" id='3' ></div><div class="t-r inline push red but unclickable" id='2'></div>
  </div>
  <div class="rw">
    <div class="b-l inline push yellow unclickable" id='1'></div><div class="b-r inline push blue but unclickable" id='0'></div>
  </div>
</div>
   <div class="center">
     <h1 class="brand">Simon<span class="small">®</span></h1>
     <div class="rw">
       <div class="display inline">
         <h1 class="count led-off">--</h1>
         <h3 class="label">COUNT</h3>
       </div>
       <div class="btn-box inline">
         <div class="round-btn full-red but clickable" id="start"></div>
         <h3 class="label">START</h3>
       </div>
       <div class="btn-box inline">
         <div class="round-btn but clickable" id="mode"></div>
         <h3 class="label">STRICT</h3>
         <div class="led" id="mode-led"></div>
       </div>
     </div>
     <div class="rw bot">
       <h3 class="label inline">OFF</h3>
       <div class="sw-slot inline">
         <div class="switch" id="pwr-sw"></div>
       </div>
       <h3 class="label inline">ON</h3>
     </div>
  </div>
</div>

              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Alfa+Slab+One|VT323|Oswald');

/* Basic Reset */
html, body, div, span, applet, object, iframe,
 h1, h2, h3, h4, h5, h6, p, blockquote, pre,
 a, abbr, acronym, address, big, cite, code,
 del, dfn, em, img, ins, kbd, q, s, samp,
 small, strike, strong, sub, sup, tt, var,
 b, u, i, center,
 dl, dt, dd, ol, ul, li,
 fieldset, form, label, legend,
 table, caption, tbody, tfoot, thead, tr, th, td,
 article, aside, canvas, details, embed, 
 figure, figcaption, footer, header, hgroup, 
 menu, nav, output, ruby, section, summary,
 time, mark, audio, video {
 	margin: 0;
 	padding: 0;
 	border: 0;
 	font-size: 100%;
 	font: inherit;
 	vertical-align: baseline;
  
   /* Disable mouse selection */
  -webkit-user-select: none; /* Chrome/Safari */        
  -moz-user-select: none; /* Firefox */
  -ms-user-select: none; /* IE10+ */

  /* Rules below not implemented in browsers yet */
  -o-user-select: none;
  user-select: none;
 }

html{
 background-image: url('http://cdn.backgroundhost.com/backgrounds/subtlepatterns/retina_wood.png');
}
.inline{
  display: inline-block;
}

.push{
  position  : relative;
  width:200px;
  height:200px;
  background-color : grey;
  border: 12px solid #333;
}

.rw{
  margin-bottom:-4px;
}

.b-r{
  border-bottom-right-radius : 100%;
}

.b-l{
  border-bottom-left-radius : 100%;
}

.t-l{
  border-top-left-radius : 100%;
}

.t-r{
  border-top-right-radius : 100%;
} 

.wrap{
  width: 472px;
  height:472px;
  border-radius:100%;
  position: relative;
  text-align: center;
  margin:auto;
  background-color:#333;
  top:10vh;
  box-shadow: 0px 0px 12px #222;
}

.wrap-in{
  position: relative;
  top:12px;
}
.center{
  width:220px;
  height:220px;
  position : absolute;
  border-radius:100%;
  top:50%;
  left:50%;
  margin: -122px 0 0  -122px;
  background-color:#ECE7EE;
  border: 12px solid #333;
}

.brand{
  font-family: 'Alfa Slab One', cursive;
  color : #222;
  font-size: 3.2em;
  margin-top : 35px;
}

.brand .small{
  font-size : 0.3em;
  position : relative;
  top : -20px;
}

.count{
  font-family: 'VT323', monospace;
  color : #DC0D29;
  padding : 0px;
  font-size : 2em;
  width : 50px;
  background-color: #32050C;
  position:relative;
  border : 4px solid #222;
  border-radius : 10px;
  margin:auto;
}

.round-btn{
  width : 20px;
  height : 20px;
  position: relative;
  background-color : yellow;
  border-radius : 100%;
  border : 4px solid #444;
  box-shadow : 0px 2px 3px #222;
  margin:auto;
  top : -5px;
}

.round-btn:active{
    box-shadow : 0 1px 1px #292929;
    top : -4px;
}

.clickable{
  pointer-events : auto;
  cursor:pointer;
}

.unclickable{
  pointer-events:none;
}

.led{
  width:6px;
  height:6px;
  background-color: #32050C;
  border-radius : 100%;
  position: absolute;
  left:0;
  right: 0;
  margin : auto;
  border: 2px solid #222;
  top: -18px;
}

.led-on{
  background-color:#DC0D29;
}

.led-off{
  color:#430710;
}

.label{
  color : #222;
  font-family : 'Oswald',Arial,sans;
  font-size:0.7em;
  margin-top:5px;
  text-align:center;
}

.display{
  width : 60px;
  position:relative;
  text-align:center;
}

.btn-box{
  width : 50px;
  position:relative;
}

.sw-slot{
  height:20px;
  width:40px;
  background-color : #222;
  position:relative;
  top:5px;
  border-radius:2px;
  cursor: pointer;
}

.switch{
  height:16px;
  width: 16px;
  border-radius:4px;
  background-color : #3193DE;
  position:relative;
  border : 2px solid #333;
}

.sw-on{
  left:20px;
}
.rw.bot{
  margin-top: 10px;
}
.full-red{
  background-color : #FC0102;
}
.red{
  background-color : #9f0f17;
}

.green{
  background-color : #00a74a;
}

.yellow{
  background-color : #cca707;
}

.blue{
  background-color : #094a8f;
}

.yellow.light{
  background-color : #fed93f;
}

.blue.light{
  background-color : #1c8cff;
}

.red.light{
  background-color : #ff4c4c;
}

.green.light{
  background-color : #13ff7c;
}

/* Scaling for Mobile */
@media screen and (max-width: 500px){

  .wrap {
    top: 40px;
    
    -moz-transform: scale(0.6);
    -ms-transform: scale(0.6);
    -o-transform: scale(0.6);
    -webkit-transform: scale(0.6);
    transform: scale(0.6);
    
    -o-transform-origin: 0 0;
    -ms-transform-origin: 0 0;
    -webkit-transform-origin: 0 0;
    -moz-transform-origin: 0 0;
    transform-origin: 0 0;
    
    left: 50%;
    margin-left: -142px;
  }
}

              
            
!

JS

              
                /**
*             SIMON GAME
*         for freeCodeCamp.com
*
*           by EmAnt - 2015
*
*     Simple Game using CSS3 & jQuery
*
***********************************************
* !!! It uses the new Web Audio API !!!
* You Need an up-to-date browser.
* Tested on Firefox, Chrome, Safari
***********************************************
*/


$(document).ready(function(){

  // Checking for Web Audio API on your browser ...
  var AudioContext = window.AudioContext // Default
    || window.webkitAudioContext // Safari and old versions of Chrome
    || false;

  if(!AudioContext) {

    // Sorry, but the game won't work for you
    alert('Sorry, but the Web Audio API is not supported by your browser.'
    + ' Please, consider downloading the latest version of '
    + 'Google Chrome or Mozilla Firefox');

  } else {

    // You can play the game !!!!
    var audioCtx = new AudioContext();
    audioCtx.suspend();
    var frequencies = [329.63,261.63,220,164.81];

    var errOsc = audioCtx.createOscillator();
    errOsc.type = 'triangle';
    errOsc.frequency.value = 110;
    errOsc.start(0.0); //delay optional parameter is mandatory on Safari
    var errNode = audioCtx.createGain();
    errOsc.connect(errNode);
    errNode.gain.value = 0;
    errNode.connect(audioCtx.destination);

    var ramp = 0.01;
    var vol = 0.5;

    var gameStatus = {};

    gameStatus.reset = function(){
      this.init();
      this.strict = false;
    }

    gameStatus.init = function(){
      this.lastPush = $('#0');
      this.sequence = [];
      this.tStepInd = 0;
      this.index = 0;
      this.count = 0;
      this.lock = false;
    };

    // create Oscillators
    var oscillators = frequencies.map(function(frq){
      var osc = audioCtx.createOscillator();
      osc.type = 'sine';
      osc.frequency.value = frq;
      osc.start(0.0); //delay optional parameter is mandatory on Safari
      return osc;
    });

    var gainNodes = oscillators.map(function(osc){
      var g = audioCtx.createGain();
      osc.connect(g);
      g.connect(audioCtx.destination);
      g.gain.value = 0;
      return g;
    });


    function playGoodTone(num){
      gainNodes[num].gain
        .linearRampToValueAtTime(vol, audioCtx.currentTime + ramp);
      gameStatus.currPush = $('#'+num);
      gameStatus.currPush.addClass('light');
    };

    function stopGoodTones(){
      if(gameStatus.currPush)
        gameStatus.currPush.removeClass('light');
      gainNodes.forEach(function(g){
        g.gain.linearRampToValueAtTime(0, audioCtx.currentTime + ramp);
      });
      gameStatus.currPush = undefined;
      gameStatus.currOsc = undefined;
    };

    function playErrTone(){
      errNode.gain.linearRampToValueAtTime(vol, audioCtx.currentTime + ramp);
    };

    function stopErrTone(){
      errNode.gain.linearRampToValueAtTime(0, audioCtx.currentTime + ramp);
    };

    function gameStart(){
      audioCtx.resume();
      resetTimers();
      stopGoodTones();
      stopErrTone();
      $('.count').text('--').removeClass('led-off');
      flashMessage('--',1);
      gameStatus.init();
      addStep();
    }

    function setTimeStep(num){
      var tSteps = [1250 , 1000 , 750, 500 ];
      if (num < 4)
        return tSteps[0];
      if (num < 8)
        return tSteps[1];
      if (num < 12)
        return tSteps[2];
      return tSteps[3];
    }

    function notifyError(pushObj){
      gameStatus.lock = true;
      $('.push').removeClass('clickable').addClass('unclickable');
      playErrTone();
      if(pushObj)
        pushObj.addClass('light');
      gameStatus.toHndl = setTimeout(function(){
        stopErrTone();
        if(pushObj)
          pushObj.removeClass('light');
        gameStatus.toHndlSt = setTimeout(function(){
          if(gameStatus.strict)
            gameStart()
            else
              playSequence();
        },1000);
      },1000);
      flashMessage('!!',2);
    };

    function notifyWin(){
      var cnt = 0;
      var last = gameStatus.lastPush.attr('id');
      gameStatus.seqHndl = setInterval(function(){
        playGoodTone(last);
        gameStatus.toHndl = setTimeout(stopGoodTones,80);
        cnt++;
        if(cnt === 8){
          clearInterval(gameStatus.seqHndl);
        }
      },160);
      flashMessage('**',2);
    }

    function flashMessage(msg,times){
      $('.count').text(msg);
      var lf = function(){
        $('.count').addClass('led-off');
        gameStatus.toHndlFl = setTimeout(function(){
          $('.count').removeClass('led-off');
        },250);
      };
      var cnt = 0;
      lf();
      gameStatus.flHndl = setInterval(function(){
        lf();
        cnt++;
        if(cnt === times)
          clearInterval(gameStatus.flHndl);
      },500)
    };

    function displayCount(){
      var p = (gameStatus.count < 10) ? '0' : '';
      $('.count').text(p+(gameStatus.count+''));
    }

    function playSequence(){
      var i = 0;
      gameStatus.index = 0;
      gameStatus.seqHndl = setInterval(function(){
        displayCount();
        gameStatus.lock = true;
        playGoodTone(gameStatus.sequence[i]);
        gameStatus.toHndl = setTimeout(stopGoodTones,gameStatus.timeStep/2 - 10);
        i++;
        if(i === gameStatus.sequence.length){
          clearInterval(gameStatus.seqHndl);
          $('.push').removeClass('unclickable').addClass('clickable');
          gameStatus.lock = false;
          gameStatus.toHndl = setTimeout(notifyError,5*gameStatus.timeStep);
        }
      },gameStatus.timeStep);
    };

    function addStep(){
      gameStatus.timeStep = setTimeStep(gameStatus.count++);
      gameStatus.sequence.push(Math.floor(Math.random()*4));
      gameStatus.toHndl=setTimeout(playSequence,500);
    };

    function resetTimers(){
      clearInterval(gameStatus.seqHndl);
      clearInterval(gameStatus.flHndl);
      clearTimeout(gameStatus.toHndl);
      clearTimeout(gameStatus.toHndlFl);
      clearTimeout(gameStatus.toHndlSt);
    };

    function pushColor(pushObj){
      if(!gameStatus.lock) {
        clearTimeout(gameStatus.toHndl);
        var pushNr = pushObj.attr('id');
        if( pushNr == gameStatus.sequence[gameStatus.index]
            && gameStatus.index < gameStatus.sequence.length){

          playGoodTone(pushNr);
          gameStatus.lastPush = pushObj;
          gameStatus.index++;
          if(gameStatus.index < gameStatus.sequence.length){
            gameStatus.toHndl = setTimeout(notifyError,5*gameStatus.timeStep);
          }else if (gameStatus.index == 20){
            $('.push').removeClass('clickable').addClass('unclickable');
            gameStatus.toHndl = setTimeout(notifyWin,gameStatus.timeStep);
          }else{
            $('.push').removeClass('clickable').addClass('unclickable');
            addStep();
          }
        }else{
          $('.push').removeClass('clickable').addClass('unclickable');
          notifyError(pushObj);
        }
      }
    }

    $('.push').mousedown(function(){
      pushColor($(this));
    });

    $('*').mouseup(function(e){
      e.stopPropagation();
      if(!gameStatus.lock)
        stopGoodTones();
    });


    function toggleStrict(){
      $('#mode-led').toggleClass('led-on');
      gameStatus.strict = !gameStatus.strict;
    }

    $('.sw-slot').click(function(){
      $('#pwr-sw').toggleClass('sw-on');
      if($('#pwr-sw').hasClass('sw-on')==false){
        gameStatus.reset();
        $('.count').text('--');
        $('.count').addClass('led-off');
        $('#mode-led').removeClass('led-on');
        $('.push').removeClass('clickable').addClass('unclickable');
        $('#start').off('click');
        $('#mode').off('click');
        $('.btn').removeClass('unclickable').addClass('clickable');
        resetTimers();
        stopGoodTones();
        stopErrTone();
      }else{
        $('.btn').removeClass('unclickable').addClass('clickable');
        $('.count').removeClass('led-off');
        $('#start').click(gameStart);
        $('#mode').click(toggleStrict);
      }
    });

    gameStatus.reset();

  }
});

              
            
!
999px

Console