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HTML

              
                <div id="outerCircle">
  <div class="bigButton" id="greenButton" data-sound="0">
    <audio src="https://s3.amazonaws.com/freecodecamp/simonSound1.mp3"></audio>
  </div>
  <div class="bigButton" id="redButton" data-sound="1">
    <audio src="https://s3.amazonaws.com/freecodecamp/simonSound2.mp3"></audio>
  </div>
  <div class="bigButton" id="yellowButton" data-sound="2">
    <audio src="https://s3.amazonaws.com/freecodecamp/simonSound3.mp3"></audio>
  </div>
  <div class="bigButton" id="blueButton" data-sound="3">
    <audio src="https://s3.amazonaws.com/freecodecamp/simonSound4.mp3"></audio>
  </div>
  <div id="innerCircle">
    <div class="additionalBorder">
      <p id="tradeMark">simon<span id="reg">&reg;</span></p>
      <div class="partition"></div>
      <div class="buttons">
        <table>
          <tr class="firstRow">
            <td>
              <div class="innerCount"></div>
            </td>
            <td>
              <button type="button" id="innerStart"></button>
            </td>
            <td>
              <div class="strict">
                <div id="strictIndicator"></div>
                <button type="button" id="strictButton"></button>
              </div>
            </td>
          </tr>
          <tr class="labels">
            <td>
              <div id="countLabel">COUNT</div>
            </td>
            <td>
              <div id="startLabel">START</div>
            </td>
            <td>
              <div id="strictLabel">STRICT</div>
            </td>
          </tr>
        </table>
        <div id="switcher">
          <span class="labels">ON</span>
          <div class="checkbox">
            <input id="checkMe" type="checkbox">
            <label for="checkMe"></label>
          </div>
          <span class="labels">OFF</span>
        </div>
      </div>
    </div>
  </div>
</div>
<div class="player">You are the Winner !!!</div>
              
            
!

CSS

              
                @font-face {
  font-family: myDirector;
  src: url('https://raw.githubusercontent.com/Y-Taras/FreeCodeCamp/master/Simon/fonts/myDirector-Bold.otf');
}

body {
    background-color: #646770;
    background-image: 
        linear-gradient(0deg, rgba(255,255,255,0.40) 0%, rgba(0,0,0,0.40) 100%),
        radial-gradient(at 50% 87%, rgba(255,255,255,0.30) 0%, rgba(0,0,0,0.30) 100%);
    
background-blend-mode: multiply,normal;}

#outerCircle {
  display: flex;
  flex-wrap: wrap;
  margin: 0 auto;
  width: 560px;
  border: 2px dotted grey;
  position: relative;
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

.bigButton {
  height: 250px;
  width: 250px;
  border: solid #464646;
  transition: all 1s;
  -webkit-transition: all 1s;
  -moz-transition: all 1s;
}

#greenButton {
  background-color: rgb(9, 174, 37);
  border-radius: 100% 0 0 0;
  border-width: 20px 10px 10px 20px;
}

.liteGreen#greenButton {
  background-color: #86f999;
}

#redButton {
  background-color: rgb(174, 9, 15);
  border-radius: 0 100% 0 0;
  border-width: 20px 20px 10px 10px;
}

.liteRed#redButton {
  background-color: #f9868a;
}

#yellowButton {
  background-color: rgb(174, 174, 9);
  border-radius: 0 0 0 100%;
  border-width: 10px 10px 20px 20px;
}

.liteYell#yellowButton {
  background-color: #f9f986;
}

#blueButton {
  background-color: rgb(9, 37, 174);
  border-radius: 0 0 100% 0;
  border-width: 10px 20px 20px 10px;
}

.liteBlue#blueButton {
  background-color: #8699f9;
}

div#innerCircle {
  border: 15px solid #464646;
  border-radius: 50%;
  position: absolute;
  top: 25%;
  right: 25%;
  background-color: #c4c7ce;
}

div.additionalBorder {
  margin: 4px;
  border-radius: 50%;
  height: 242px;
  width: 242px;
  overflow: hidden;
}

p#tradeMark {
  margin: auto;
  height: 104px;
  text-align: center;
  font-size: 68px;
  font-family: myDirector;
  color: #c4c7ce;
  background-color: black;
  border-color: antiquewhite;
  line-height: 162px;
}

span#reg {
  font-size: 12px;
}

.partition {
  height: 6px;
}

.buttons {
  height: 128px;
  border-radius: 0 0 128px 128px;
  border: 2px solid black;
}


/* Start and Strict buttons*/

table {
  margin-left: 5px;
}

td {
  text-align: center;
  width: auto;
  padding: 2px 10px;
  vertical-align: bottom;
}

div.innerCount {
  width: 54px;
  height: 40px;
  background-color: #34000e;
  color: crimson;
  border-radius: 11px;
  font-size: 28px;
  line-height: 42px;
  text-align: center;
  font-family: 'Segment7Standard', italic;
}

button#innerStart {
  width: 27px;
  height: 27px;
  border: 4px solid #404241;
  border-radius: 50%;
  background: #a50005;
  box-shadow: 0 0 3px gray;
  cursor: pointer;
}

div.strict {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

button#strictButton {
  width: 27px;
  height: 27px;
  border: 4px solid #404241;
  border-radius: 50%;
  background: yellow;
  box-shadow: 0 0 3px gray;
  cursor: pointer;
}

div#strictIndicator {
  width: 6px;
  height: 6px;
  margin-bottom: 2px;
  background-color: #850000;
  border-radius: 50%;
  border: 1px solid #5f5f5f;
}

#switcher {
  display: flex;
  justify-content: center;
  align-items: center;
}

.labels {
  font-family: 'Roboto', sans-serif;
  margin: 4px;
}


/* toggle switch */

.checkbox > input[type=checkbox] {
  visibility: hidden;
}

.checkbox {
  display: inline-block;
  position: relative;
  width: 60px;
  height: 30px;
  border: 1px solid #9f9fa1;
}

.checkbox > label {
  position: absolute;
  width: 40px;
  height: 26px;
  top: 2px;
  right: 2px;
  background-color: #a50005;
  cursor: pointer;
}

.checkbox > input[type=checkbox]:checked + label {
  right: 18px;
}

div#outerCircle + div {
  font-family: myDirector;
  color: #c4c7ce;
  text-align: center;
  margin: 0 auto;
  width: 560px;
  transition: all 2s;
}

.player {
  visibility: hidden;
  padding-top: 10px;
}

.winner {
  visibility: visible;
  padding-top: 20px;
  font-size: 42px;
}
              
            
!

JS

              
                document.addEventListener("DOMContentLoaded", function() {
  'use strict';

  var checkOn = document.querySelector("input[type=checkbox]");
  var gameCount = document.getElementsByClassName("innerCount")[0];
  var startButton = document.getElementById("innerStart");
  var strictButton = document.getElementById("strictButton");
  var strictInd = document.getElementById("strictIndicator");
  var strictMode = false;
  var playGameActive = false;
  var indexButton = 0;
  var stopPlayDiv = false;

  var soundArray = document.getElementsByTagName("audio");
  var message = document.querySelector('.player');
  var buttons = document.querySelectorAll(".bigButton");
  var buttonArray = [].slice.call(buttons, 0);

  checkOn.addEventListener("change", function() {

    if (checkOn.checked) {
      gameCount.innerHTML = "--";
      strictMode = false;
    } else {
      gameCount.innerHTML = "";
      for (let i = 0; i < 4; i++) {
        buttonArray[i].removeEventListener("click", checker, false)
      }
    }
  });

  strictButton.addEventListener("click", function() {
    if (checkOn.checked) {
      strictMode = !strictMode;
      strictMode ? strictInd.style.backgroundColor = "#FF0000" :
        strictInd.style.backgroundColor = "#850000";
    }
  });

  function getRandArray() {
    var array = [];
    for (var i = 0; i < 22; i++) {
      array[i] = Math.floor(Math.random() * 4);
    }
    return array;
  }

  var randIndexArr,
    counter;

  startButton.addEventListener("click", function() {
    if (checkOn.checked) {
      if (playGameActive) {
        for (let i = 0; i < 4; i++) {
          buttonArray[i].removeEventListener("click", checker, false)
        }
        stopPlayDiv = true;
      }
      playGameActive = true;
      counter = 0;
      indexButton = 0;
      randIndexArr = getRandArray();
      console.log(randIndexArr);
      sleep(700).then(function() {
        playGame();
      });
    }

  });

  function sleep(time) {
    return new Promise(resolve => {
      setTimeout(resolve, time)
    })

  }

  var checker = function checker(e) {
    var clickedButtonId = e.target.dataset.sound;
    lightenButton(clickedButtonId);
    if (+(clickedButtonId) === randIndexArr[indexButton]) {
      if (indexButton === counter) {
        counter++;
        for (let i = 0; i < 4; i++) {
          buttonArray[i].removeEventListener("click", checker, false)
        }
        sleep(2000).then(function() {
          indexButton = 0;
          playGame();
        });
      }
      indexButton++;
    } else {
      gameCount.innerHTML = "--";
      if (strictMode) {
        indexButton = 0;
        counter = 0;
      } else {
        indexButton = 0;
      }
      sleep(2000).then(function() {
        playGame();
      });
    }
  };

  function playGame() {
    stopPlayDiv = false;
    if (counter === 5) {
      Promise.resolve()
        .then(function() {
          message.classList.add('winner');
        })
        .then(function() {
          return sleep(2500);
        })
        .then(function() {
          message.classList.remove('winner');
        });
      return;
    }
    //Show the level of the Game
    gameCount.innerHTML = counter + 1;
    //Light and play user's input then check if input is correct
    randIndexArr.slice(0, counter + 1).reduce(function(promise, div, index) {
      return promise.then(function() {

        if (!stopPlayDiv) {
          lightenButton(div)
        } else {
          return;
        }
        return new Promise(function(resolve, reject) {
          setTimeout(function() {
            resolve();
          }, 1000);
        })
      })
    }, Promise.resolve()).then(function() {
      for (var i = 0; i < 4; i++) {
        buttonArray[i].addEventListener("click", checker, false)
      }
    });
  }

  function lightenButton(id) {
    if (checkOn.checked) {
      var lightColorsArr = ["liteGreen", "liteRed", "liteYell", "liteBlue"];
      soundArray[id].play();
      buttonArray[id].classList.add(lightColorsArr[id]);
      sleep(500).then(function() {
        buttonArray[id].classList.remove(lightColorsArr[id])
      });
    }

  }

});
              
            
!
999px

Console