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HTML

            
              <div class="board">
  <img class="logo animated tada" src="http://image.ibb.co/ngugbR/logo.png" />
  
    <button id="strict" class="modes">MODE:CASUAL</button>
  
  <button class="animated bounceIn circle" id="red"></button>
  <button class="animated bounceIn circle" id="blue"></button>
  
  <div class="animated bounceIn" id="score">
    <button id="start" class="modes">START</button>
    <div class="count"></div>
  </div>
  
  <button class="animated bounceIn circle" id="green"></button>
  <button class="animated bounceIn circle" id ="yellow"></button>
</div>
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CSS

            
              .logo{
  float:right;
}

.board{
  margin:0 auto;
  height:80%;
  width:500px;
}

.circle{
  border:10px solid white;
  outline:none;
  position: relative;
  border-radius: 50%;
}

.circle:hover{
  cursor:pointer;
}

.circle:active{
  filter:brightness(400%);
}

.modes{
  color:white;
  outline:none;
  height:30px;
  font-size:15px;
  border-radius:10px;
  font-family:"Press Start 2P";

}

#score{
  color:white;
  margin:0 auto;
  width:150px;
  height:150px;
  text-align:center;
  font-size:25px;
  font-family:"Press Start 2P";
}

#start{
  background:green;
  border-color:green;
  margin-bottom:5px;
}

#strict{
  float:right;
  background:red;
  border-color:red;
  margin-bottom:10px;
}

#red{
  background:#8a1c0f;
  width: 180px;
  height: 180px;
}

#blue{
  top:-25px;
  float:right;
  background:#2e66c1;
  width:100px;
  height:100px;
}

#green{
  top:-75px;
  background:#00802b;
  width:220px;
  height:220px;
}

#yellow{
  top:-50px;
  left:-50px;
  float:right;
  background:#b3b300;
  width:150px;
  height:150px;
}

button:active{
   transform: translate(0px, 3px);
}

.active{
  filter:brightness(400%);
}

body{
  background:url('https://image.ibb.co/iuaiSo/bg.jpg') no-repeat center center fixed;
  -webkit-background-size:cover;
  -moz-background-size:cover;
  -o-background-size:cover;
  background-size:cover;
}
!

JS

            
              const b = ["#green", "#red", "#blue", "#yellow"];
t = 0; //button presses won't work until game is started
str = 0; //strict
started = 0; //game on
uSay = sSays = []; //your moves/simon moves


//toggling strict mode
$("#strict").click(function() {
  if (str === 1) {
    str = 0;
    $("#strict").html("MODE:CASUAL");
  } else {
    str = 1;
    $("#strict").html("MODE:STRICT");
  }
});

//sfx
const vol = 30
const green = new buzz.sound("https://s3.amazonaws.com/freecodecamp/simonSound1.mp3", {volume: vol});
const red = new buzz.sound("https://s3.amazonaws.com/freecodecamp/simonSound2.mp3", {volume: vol});
const blue = new buzz.sound("https://s3.amazonaws.com/freecodecamp/simonSound3.mp3", {volume: vol});
const yellow = new buzz.sound("https://s3.amazonaws.com/freecodecamp/simonSound4.mp3", {volume: vol});
const failSound = new buzz.sound("http://www.freesound.org/data/previews/331/331912_3248244-lq.mp3", {volume: 10});

//clear lights and sound
clrLight = function() {
  $(b.join(", ")).removeClass("active");
  buzz.all().stop();
};

var simonTurn = function() {
  t = 0;
  uSay = []; // clear user presses
  var s = 450; //set game speed
  var x = 1.8; //speed multiplier
  
// add random to sequence
  if (nR || sSays.length === 0) { 
    sSays.push(Math.floor((Math.random() * 4)));
  }

  if (sSays.length > 9) {
    x = 1.15;
    $(".count").html(sSays.length);
  } else if (sSays.length < 10)
    $(".count").html("0" + sSays.length);
  if (sSays.length > 4) {
    x = 1.25;
  }

  setTimeout(function() {
    t = 1; // let the user play
  }, sSays.length * (x * s) - 100);
  for (var i in sSays) {
    sPlay(i);
  }
  function sPlay(i) {
    setTimeout(function() {
      if (started === 1) {
        $(b[sSays[i]]).addClass("active");
        eval((b[sSays[i]].substring(1))).play();
        setTimeout(clrLight, s);
      }
    }, i * (x * s)); // time between notes
   };
  };

$("#start").click(function() {
  
  $("#start").html("RESTART");
  started = 1;
  clrLight();
  uSay = sSays = [];
  nR = 1; // start a new round
  setTimeout(simonTurn, 1000);
});

 // when user presses button
$(b.join(", ")).mousedown(function() {
  
  if (t && started === 1) {
    uSay.push(b.indexOf("#" + this.id));
    $(this).addClass("active");
    var place = uSay.length;
   
    if (uSay[place - 1]^sSays[place - 1]) {
      $(".count").html("Wrong!");
      failSound.play();
      t = nR = 0; // end user turn
      setTimeout(clrLight, 1000);
      
      if (str === 1) uSay = sSays = []; // empty in strict mode
      setTimeout(simonTurn, 2800); // longer delay on failure
    } else if (place === 20) {
      $(b.join(", ")).addClass("active");
      $(".count").html("You win!!");
      sSays = [];
      t = 0; // end user turn
      setTimeout(simonTurn, 4000);
    } else {
      eval(this.id).play();
      if (place === sSays.length) {
        t = 0; // end user turn
        setTimeout(clrLight, 1000);
        nR = 1; // proceed to next level
        setTimeout(simonTurn, 1500);
      }
    }
  }
}).mouseup(function() {
  if (t) setTimeout(clrLight, 200);
});
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