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HTML 

              
                <body>
  <div id="simon">
    <div class="container-fluid row no-gutter">
      <div class="col-xs-6">
        <div id="green" class="green click pull-right"></div>
      </div>
      <div class="col-xs-6">
        <div id="red" class="red click col-xs-6 pull-left"></div>
      </div>
      <div class="col-xs-6">
        <div id="yellow" class="yellow click col-xs-6 pull-right"></div>
      </div>
      <div class="col-xs-6">
        <div id="blue" class="blue click col-xs-6 pull-left"></div>
      </div>
    </div>
  </div>
  <div class="center container row" id="buttons">
    <div class="col-xs-12">
      <button class="btn btn-info outline" id="go" onclick="start()">GO</button>
      <button class="btn btn-info outline" id="reset" onclick="reset()">RESET</button>
      <div class="vcenter" id="moves">0</div>

      <div class="onoffswitch vcenter">
        <input type="checkbox" name="onoffswitch" class="onoffswitch-checkbox" id="myonoffswitch">
        <label class="onoffswitch-label" for="myonoffswitch">STRICT</label>
      </div>
    </div>
  </div>
</body>
!

CSS 

              
                /*Textures from http://lea.verou.me/css3patterns/ 
  body{} has the cube texture.
*/
body {
  background-color: #556;
  background-image: linear-gradient(30deg, #445 12%, transparent 12.5%, transparent 87%, #445 87.5%, #445), linear-gradient(150deg, #445 12%, transparent 12.5%, transparent 87%, #445 87.5%, #445), linear-gradient(30deg, #445 12%, transparent 12.5%, transparent 87%, #445 87.5%, #445), linear-gradient(150deg, #445 12%, transparent 12.5%, transparent 87%, #445 87.5%, #445), linear-gradient(60deg, #99a 25%, transparent 25.5%, transparent 75%, #99a 75%, #99a), linear-gradient(60deg, #99a 25%, transparent 25.5%, transparent 75%, #99a 75%, #99a);
  background-size: 80px 140px;
  background-position: 0 0, 0 0, 40px 70px, 40px 70px, 0 0, 40px 70px;
}

.center {
  text-align: center;
}

.vcenter {
  display: inline-block;
  vertical-align: middle;
  float: none;
}

#simon {
  margin-top: 20px;
  margin-bottom: 20px;
}

#moves {
  background-color: grey;
  display: inline-block;
  width: 50px;
  height: 50px;
  font-size: 30px;
  font-weight: bold;
  text-align: center;
  border-radius: 100%;
  line-height: 50px;    /*vertical center*/
  white-space: nowrap;  /*               */
  color: white;
}

/*for GO & reset buttons*/
.btn.outline {
  background: none;
  border-radius: 100%;
  height: 50px;
  border: 3px solid white;
  color: white;
}

.btn.outline:hover,
.btn.outline:focus,
.btn.outline:active,
.btn.outline.active {
  color: grey;
  background: none;
  border-color: grey;
}

.btn.outline:active,
.btn.outline.active {
  border-color: grey;
  color: grey;
  background: none;
  box-shadow: none;
}
/*           */

/*buttons container*/
#buttons {
  height: 50px;
  margin: 0 auto;
}

#go {
  font-size: 20px;
  font-weight: bold;
}

#reset {
  font-size: 12px;
  font-weight: bold;
}

#green, #red, #yellow, #blue {
  height: 120px;
  width: 120px;
  display: inline-block;
  border: 4px solid grey;
  -webkit-box-shadow: 10px 10px 24px 0px rgba(0, 0, 0, 0.75);
  -moz-box-shadow: 10px 10px 24px 0px rgba(0, 0, 0, 0.75);
  box-shadow: 10px 10px 24px 0px rgba(0, 0, 0, 0.75);
  opacity: .8;
}

/* Color-specific border-radius & color textures below.
   The textures could possibly be combined into one class */
#green {
  background-color: green;
  border-radius: 100% 10% 10% 10%;
  background: linear-gradient(63deg, green 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, green 78%), linear-gradient(63deg, transparent 34%, green 38%, green 58%, transparent 62%), #005900;
  background-size: 16px 48px;
}

#red {
  background-color: red;
  border-radius: 10% 100% 10% 10%;
  background: linear-gradient(63deg, #b20000 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #b20000 78%), linear-gradient(63deg, transparent 34%, #b20000 38%, #b20000 58%, transparent 62%), #990000;
  background-size: 16px 48px;
}

#yellow {
  background-color: orange;
  border-radius: 10% 10% 10% 100%;
  background: linear-gradient(63deg, orange 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, orange 78%), linear-gradient(63deg, transparent 34%, orange 38%, orange 58%, transparent 62%), #b27300;
  background-size: 16px 48px;
}

#blue {
  background-color: blue;
  border-radius: 10% 10% 100% 10%;
  background: linear-gradient(63deg, blue 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, blue 78%), linear-gradient(63deg, transparent 34%, blue 38%, blue 58%, transparent 62%), #0000b2;
  background-size: 16px 48px;
}

/*Color-specific user-click transitions below. */
.click {
  -webkit-transition: all .07s cubic-bezier(0.645, 0.045, 0.355, 1);
  transition: all .07s cubic-bezier(0.645, 0.045, 0.355, 1);
}

.click:active {
  box-shadow: none;
}

/*The four classes below take care of both
  tap-click and press-hold clicks. The .push
  classes are added by jquery. */
.red.push, .red.click:active {
  transform: scale(0.95) translateY(2px) translateX(-2px);
  background: linear-gradient(63deg, #ff4d4d 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #ff4d4d 78%), linear-gradient(63deg, transparent 34%, #ff4d4d 38%, #ff4d4d 58%, transparent 62%), #990000 !important;
  background-size: 16px 48px !important;
}

.green.push, .green.click:active {
  transform: scale(0.95) translateY(2px) translateX(2px);
  background: linear-gradient(63deg, #00cd00 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #00cd00 78%), linear-gradient(63deg, transparent 34%, #00cd00 38%, #00cd00 58%, transparent 62%), #005900 !important;
  background-size: 16px 48px !important;
}

.yellow.push, .yellow.click:active {
  transform: scale(0.95) translateY(-2px) translateX(2px);
  background: linear-gradient(63deg, #ffc04d 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #ffc04d 78%), linear-gradient(63deg, transparent 34%, #ffc04d 38%, #ffc04d 58%, transparent 62%), #b27300 !important;
  background-size: 16px 48px !important;
}

.blue.push, .blue.click:active {
  transform: scale(0.95) translateY(-2px) translateX(-2px);
  background: linear-gradient(63deg, #4d4dff 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #4d4dff 78%), linear-gradient(63deg, transparent 34%, #4d4dff 38%, #4d4dff 58%, transparent 62%), #0000b2 !important;
  background-size: 16px 48px !important;
}


/*Color-specific pop-out transitions below. */
.showMe {
  transform: scale(1.05);/* translateY(-2px) translateX(2px);*/
}

.green.showMe {
  /*transform: scale(1.05) translateY(-2px) translateX(-2px);*/
  background: linear-gradient(63deg, #00cd00 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #00cd00 78%), linear-gradient(63deg, transparent 34%, #00cd00 38%, #00cd00 58%, transparent 62%), #005900 !important;
  background-size: 16px 48px !important;
}

.red.showMe {
  /*transform: scale(1.05) translateY(-2px) translateX(2px);*/
  background: linear-gradient(63deg, #ff4d4d 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #ff4d4d 78%), linear-gradient(63deg, transparent 34%, #ff4d4d 38%, #ff4d4d 58%, transparent 62%), #990000 !important;
  background-size: 16px 48px !important;
}

.yellow.showMe {
  /*transform: scale(1.05) translateY(-2px) translateX(2px);*/
  background: linear-gradient(63deg, #ffc04d 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #ffc04d 78%), linear-gradient(63deg, transparent 34%, #ffc04d 38%, #ffc04d 58%, transparent 62%), #b27300 !important;
  background-size: 16px 48px !important;
}

.blue.showMe {
  /*transform: scale(1.05) translateY(-2px) translateX(2px);*/
  background: linear-gradient(63deg, #4d4dff 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #4d4dff 78%), linear-gradient(63deg, transparent 34%, #4d4dff 38%, #4d4dff 58%, transparent 62%), #0000b2 !important;
  background-size: 16px 48px !important;
}


/* Toggle switch below.
   Generated using https://proto.io/freebies/onoff/
*/
.onoffswitch {
  display: inline-block;
  position: relative;
  width: 50px;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

.onoffswitch-checkbox {
  display: none;
}

.onoffswitch-label {
  display: block;
  overflow: hidden;
  cursor: pointer;
  height: 24px;
  padding: 0;
  line-height: 24px;
  border: 2px solid #CCCCCC;
  border-radius: 24px;
  background-color: blue;
  transition: background-color 0.2s linear;
  color: white;
  font-size: 12px;
}

.onoffswitch-label:before {
  color: white;
  opacity: .5;
  content: "";
  display: block;
  width: 26px;
  height: 24px;
  margin: 0px;
  background: #FFFFFF;
  position: absolute;
  top: 0;
  bottom: 0;
  right: 24px;
  border: 2px solid green;
  border-radius: 24px;
  transition: all 0.2s linear;
}

.onoffswitch-checkbox:checked + .onoffswitch-label {
  background-color: red;
}

.onoffswitch-checkbox:checked + .onoffswitch-label,
.onoffswitch-checkbox:checked + .onoffswitch-label:before {
  border-color: green;
}

.onoffswitch-checkbox:checked + .onoffswitch-label:before {
  right: 0px;
}


/*Non-strict error animation below. 
  Applied with mistake()
*/
.mistake {
  background: linear-gradient(63deg, #808080 23%, transparent 23%) 7px 0, linear-gradient(63deg, transparent 74%, #808080 78%), linear-gradient(63deg, transparent 34%, #808080 38%, #808080 58%, transparent 62%), #a6a6a6 !important;
  background-size: 16px 48px !important;
}


/*remove space between bootstrap columns
  from http://curabites.com/development/2015/06/14/how-to-remove-gutter-space-between-columns-in-bootstrap-3/
*/
.row.no-gutter {
  margin-left: 0;
  margin-right: 0;
}

.row.no-gutter [class*='col-']:not(:first-child),
.row.no-gutter [class*='col-']:not(:last-child) {
  padding-right: 0;
  padding-left: 0;
}
!

JS 

              
                var strict = false;
var compSequence = [];
var userSequence = [];
var lightInt = 500; //light playback delay
var counter = 0; //how many correct presses you've made
var winAt = 20; //sequence length needed to win
var sound_yellow = new Audio("https://s3.amazonaws.com/freecodecamp/simonSound4.mp3");
var sound_green = new Audio("https://s3.amazonaws.com/freecodecamp/simonSound3.mp3");
var sound_red = new Audio("https://s3.amazonaws.com/freecodecamp/simonSound2.mp3");
var sound_blue = new Audio("https://s3.amazonaws.com/freecodecamp/simonSound1.mp3");
var sound_gameover = new Audio("https://bit.ly/2i6znut");
var sound_mistake = new Audio("https://bit.ly/2hDtBwZ");
var sound_toggle = new Audio("https://bit.ly/2hVnoQ0");
var sound_reset = new Audio("https://bit.ly/2ieTILd");
var sound_win = new Audio("https://bit.ly/2isBt4v");

//start with colored buttons turned off
$(document).ready(function() {
  disable();
});

$('.click').click(function() {
  var input = "";
  var len = compSequence.length;
  if($(this).hasClass('red')) input = "red";
  if($(this).hasClass('green')) input = "green";
  if($(this).hasClass('yellow')) input = "yellow";
  if($(this).hasClass('blue')) input = "blue";
  userSequence.push(input);
  if(input !== compSequence[counter]) { //if you miss one, replay...
    if(strict) ending(); //...start over if you're in strict mode
    else mistake1(); //...or make ouch sound in not in strict
  } else {
    clickMe(input);
    playSound(input);
    ++counter; //otherwise, try matching next in sequence
    if(userSequence.length >= compSequence.length) {
      if(compSequence.length == winAt) win(); //if sequence is winning length, win
      else addPush(); //else, add another
      readOut();
    }
  }
});

//This does the inward-click animation.
//The css handles a tap-click.
function clickMe(color) {
  $('#' + color).addClass('push');
    setTimeout(function() {
      $('#' + color).removeClass('push');
    }, lightInt / 2);
}

//toggle strict mode
$("#myonoffswitch").click(function() {
  if(strict === false) strict = true;
  else strict = false;
  sound_toggle.play();
});

//Adds a step to the computer's sequence
function addPush() {
  disable();
  var rnd = Math.floor(Math.random() * 4); //since there are 4 buttons
  var toPush = "";
  switch(rnd) {
    case 0:
      toPush = "red";
      break;
    case 1:
      toPush = "green";
      break;
    case 2:
      toPush = "yellow";
      break;
    case 3:
      toPush = "blue";
      break;
    default:
      toPush = "ERROR";
  }
  compSequence.push(toPush);
  document.getElementById("moves").innerHTML = Number(document.getElementById("moves").innerHTML) + 1; //increment move counter
}

//Wrapper for rdOut(). It returns true so that enable() can wait for it
//to finish.
function readOut() {
  disable();
  userSequence = [];
  counter = 0;
  if(compSequence === []) return;
  setTimeout(function() {
    rdOut(compSequence, 0); //starts at index 0
  }, lightInt);
}

//A recursive function using setTimeout.
//Can't use setInterval since the interval
//isn't even.
function rdOut(seq, index) {
  var len = seq.length;
  if(len === 0 || index >= len) {
    enable();
    return;
  }
  setTimeout(function() {
    $('#' + seq[index]).addClass('showMe');
    playSound(seq[index]);
    setTimeout(function() {
      $('#' + seq[index]).removeClass('showMe');
      rdOut(seq, index + 1);
    }, lightInt / 2);
  }, lightInt);
}

//reset everything
function reset() {
  sound_reset.play();
  userSequence = [];
  compSequence = [];
  document.getElementById("moves").innerHTML = "0";
  $("#go").prop('disabled', false);
  enable();
}

//for the first move
function start() {
  enable();
  document.getElementById("moves").innerHTML = "0";
  $("#go").prop('disabled', true);
  addPush();
  if(readOut()) enable();
}

//when you lose in strict mode
function ending() {
  mistake2();
  disable();
  compSequence = [];
  userSequence = [];
  counter = 0;
  $("#go").prop('disabled', false);
}

//for a mistake in non-strict mode
function mistake1() {
  sound_mistake.play();
  var temp = document.getElementById("moves").innerHTML;
  document.getElementById("moves").innerHTML = ":(";
  $("#red").addClass("mistake");
  $("#green").addClass("mistake");
  $("#yellow").addClass("mistake");
  $("#blue").addClass("mistake");
  setTimeout(function() {
    $("#red").removeClass("mistake");
    $("#green").removeClass("mistake");
    $("#yellow").removeClass("mistake");
    $("#blue").removeClass("mistake");
    setTimeout(function() {
      document.getElementById("moves").innerHTML = temp;
      if(readOut()) enable();
    }, lightInt);
  }, lightInt);
}

//if you make a mistake in strict mode, the 
//buttons turn grey and you have to push reset or go
function mistake2() {
  sound_gameover.play();
  document.getElementById("moves").innerHTML = ":(";
  $("#red").addClass("mistake");
  $("#green").addClass("mistake");
  $("#yellow").addClass("mistake");
  $("#blue").addClass("mistake");
  disable();
}

//disable all the buttons except reset
function disable() {
     document.getElementById("red").style.pointerEvents = 'none';
   document.getElementById("green").style.pointerEvents = 'none';
  document.getElementById("yellow").style.pointerEvents = 'none';
    document.getElementById("blue").style.pointerEvents = 'none';
  $("#slider").prop('disabled', true);
}

//re-enable buttons
function enable() {
  console.log("enabled");
     document.getElementById("red").style.pointerEvents = 'auto';
   document.getElementById("green").style.pointerEvents = 'auto';
  document.getElementById("yellow").style.pointerEvents = 'auto';
    document.getElementById("blue").style.pointerEvents = 'auto';
        if($("#red").hasClass("mistake")) $("#red").removeClass("mistake");
    if($("#green").hasClass("mistake")) $("#green").removeClass("mistake");
  if($("#yellow").hasClass("mistake")) $("#yellow").removeClass("mistake");
      if($("#blue").hasClass("mistake")) $("#blue").removeClass("mistake");
  $("#slider").prop('disabled', false);
}

//Plays the sound matching the color. Maybe all the sounds could be consolidated here.
function playSound(color) {
  switch(color) {
    case 'yellow':
      if(!sound_yellow.ended) {
        var nother = sound_yellow.cloneNode();
        nother.play();
      } else sound_yellow.play();
      break;
    case 'green':
      if(!sound_green.ended) {
        var nother = sound_green.cloneNode();
        nother.play();
      } else sound_green.play();
      break;    
    case 'red':
      if(!sound_red.ended) {
        var nother = sound_red.cloneNode();
        nother.play();
      } else sound_red.play();
      break;    
    case 'blue':
      if(!sound_blue.ended) {
        var nother = sound_blue.cloneNode();
        nother.play();
      } else sound_blue.play();
      break;      
    default:
      console.log("sounds are broken");
  }
}

//HAPPY
function win() {
  sound_win.play();
  document.getElementById("moves").innerHTML = ":)";
  disable();
  compSequence = [];
  userSequence = [];
  counter = 0;
  $("#go").prop('disabled', false);
}
!
999px

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