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HTML

              
                <div class="container">
    <div class="game-container">
      <div class="game">
        <div class="section" id="green"></div>
        <div class="section" id="red"></div>
        <div class="section" id="yellow"></div>
        <div class="section" id="blue"></div>
      </div>
      <div class="game-center">
        <span id="round"></span>
      </div>
    </div>

    <div class="controls">
      <div class="controls__group">
        <div class="switch-container">
          <div class="switch"></div>
        </div>
        <span>OFF/ON</span>
      </div>
      <div class="controls__group">
        <button class="btn red" disabled>
          <div class="btn-shine"></div>
        </button>
        <span>START</span>
      </div>
      <div class="controls__group">
        <button class="btn yellow" disabled>
          <div class="btn-shine"></div>
        </button>
        <span>STRICT</span>
      </div>
    </div>
  </div>
  <div class="modal-backdrop">
    <div class="modal">
      <span>You won! You made it this far, you deserve a cookie.</span>
      <img src="http://scibosnian.com/wp-content/uploads/2017/07/Chocolate_chip_cookie.png" style="width:200px">
      <button id="restart">play again</button>
    </div>
  </div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Roboto+Mono');
body,
html {
  font-family: 'Roboto Mono', monospace;
  margin: 0;
}

.container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
}

.container > span {
  margin-top: .5rem;
}

/* --- GAME --- */
.game-container {
  position: relative;
}

.game-center {
  background: white;
  border-radius: 50%;
  position: absolute;
  width: 200px;
  height: 200px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.game {
  display: grid;
  grid-template: repeat(2, 1fr) / repeat(2, 1fr);
  margin: 1.5rem;
  width: 400px;
  height: 400px;
}

#green {
  background: #2ecc71;
  border-top-left-radius: 100%;
}

#red {
  background: lightcoral;
  border-top-right-radius: 100%;
}

#yellow {
  background: gold;
  border-bottom-left-radius: 100%;
}

#blue {
  background: lightskyblue;
  border-bottom-right-radius: 100%;
}

#round {
  color: lightgray;
  font-size: 3rem;
}

.active:active { animation: .3s animate; }
.animate-section { animation: .5s animate; }
.animate-error { animation: .5s error; }

/*GAME ANIMATIONS*/
@keyframes animate {
  0% { transform: scale(1); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

@keyframes error {
  25% { transform: translateX(-2%); }
  50% { transform: translateX(0); }
  75% { transform: translateX(2%); }
  100% { transform: translateX(0); }
}

/* --- CONTROLS --- */
.controls {
  display: flex;
  justify-content: space-around;
  align-items: center;
  padding: 1rem;
  width: 300px;
}

.controls__group {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.controls__group > span {
  font-size: 10px;
  margin-top: .5rem;
}

/* --- CONTROL BUTTONS --- */
.btn, .btn:focus {
  position: relative;
  border: 0;
  border-radius: 50%;
  width: 20px;
  height: 20px;
  margin-bottom: 6px;
  outline: 0;
}

.btn:active  {
  transform: translateY(-1px);
}

.btn-shine {
  background-color: rgba(255,255,255,0.3);
  border-radius: 50%;
  position: absolute;
  top: 3px;
  left: 5px;
  height: 5px;
  width: 10px;
}

.switch-container {
  background: #f1f1f1;
  border-radius: 1rem;
  height: 20px;
  width: 50px;
  padding: 3px;
}

.switch {
  background: lightgray;
  border-radius: 50%;
  height: 20px;
  width: 20px;
}

.move-switch-right {
  animation: .5s moveRight forwards;
  transition: all .2s ease-in;
}

.move-switch-left {
  animation: .5s moveLeft;
  transition: all .2s ease-in;
}

/* SWITCH ANIMATIONS */
@keyframes moveRight {
  0% {
    transform: translateX(0);
    background: lightgray;
  }
  100% {
    transform: translateX(150%);
    background: #2ecc71;
  }
}

@keyframes moveLeft {
  0% {
    transform: translateX(150%);
    background: #2ecc71;
  }
  100% {
    transform: translateX(0%);
    background: lightgray;
  }
}

/* CONTROL BUTTONS - COLORS */
.red { background: linear-gradient(lightcoral, #ff5050); }
.red:hover { background: #de4646; }
.red--active { box-shadow: 0 0 1rem red; }

.yellow { background: linear-gradient(#ffd700, #f7c500); }
.yellow:hover { background: #e1a900; }
.yellow--active { box-shadow: 0 0 1rem #ff9400; }

/* --- MODAL (WINNING SCREEN) --- */
.modal-backdrop {
  display: none;
  background-color: rgba(0,0,0,0.25);
  position: absolute;
  top: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  animation: .5s animate-modal;
}

.modal {
  background-color: white;
  border-radius: .5rem;
  box-shadow: 0 0 20px rgba(0,0,0,0.2);
  position: absolute;
  z-index: 2;
  padding: 3rem;
  width: 200px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.modal > button, button:focus {
  background-color: rgba(0,0,0,0.2);
  border: 0;
  border-radius: .5rem;
  color: white;
  font-family: 'Roboto Mono', monospace;
  font-size: 1rem;
  padding: .5rem;
  text-transform: uppercase;
  outline: 0;
}

.modal > button:hover {
  background-color: rgba(0,0,0,0.25);
}

/* MODAL ANIMATIONS */
@keyframes animate-modal {
  0% { opacity: 0; }
  100% { opacity: 1; }
}
              
            
!

JS

              
                /*
 *     SIMON GAME
 * for freecodecamp.com
 * by Alexis Okamura - 2018
 *
 */

const simonGame = (function() {
  const MAXROUND = 20, GAMESPEED = 1000;
  const sound = {
    blue: new Audio('https://s3.amazonaws.com/freecodecamp/simonSound1.mp3'),
    red: new Audio('https://s3.amazonaws.com/freecodecamp/simonSound2.mp3'),
    yellow: new Audio('https://s3.amazonaws.com/freecodecamp/simonSound3.mp3'),
    green: new Audio('https://s3.amazonaws.com/freecodecamp/simonSound4.mp3'),
    error: new Audio('http://ia601500.us.archive.org/4/items/simo_game_audio/error.mp3')
  };
  const game = {
    start: false,
    strictMode: false,
    power: false,
    sequence: [],
    round: 1
  };

  function init() {
    game.start = true;
    reset();
    formatRound();
    addStep();
    playSequence();
  }

  function reset() {
    game.sequence = [];
    game.round = 1;
  }

  /* Randomly adds a new color to sequence */
  function addStep() {
    const colors = ['blue', 'red', 'yellow', 'green'];
    game.sequence.push(colors[Math.floor(Math.random()*4)]);
  }

  /* Formats + sets current round on UI */
  function formatRound() {
    if(game.round < 10) {
      $('#round').text('0' + game.round);
    } else {
      $('#round').text(game.round);
    }
  }

  function playersTurn() {
    let counter = 0;
    $('.section')
      .removeClass('animate-section') // removes animation class played during playSequence
      .addClass('active'); // adds active class so section is clickable + animated
    $('.section').on('click', function() {
      let move = $(this).attr('id');
      // ERROR CHECKING
      if(game.sequence[counter] !== move) {
        $('.section').off(); // so player can't make repeated errors
        playError();
        if(game.strictMode) {
          setTimeout(function() {
            init();
          }, 100);
          counter = 0;
        } else {
          setTimeout(function() {
            playSequence();
          }, 100);
          counter = 0;
        }
      } else {
        // correct move, increase counter
        counter++;
      }

      // GAME CHECKING
      if(counter === MAXROUND) {
        // player won the game, display win screen
        $('.modal-backdrop').show();
        counter = 0;
      } else if(counter === game.sequence.length) {
        // player sucessfully did a correct round
        $('.section').off();
        game.round++;
        formatRound();
        addStep();
        playSequence();
      }
    });
  }

  function playSequence() {
    // player cannot make a move while sequence is playing
    $('.section').removeClass('active');

    let counter = 0;
    let intervals = setInterval(function() {
      if(!game.start) { // if player suddenly turns off start/power
        clearInterval(intervals);
      } else if(counter === game.sequence.length) { // sequence is done playing
        clearInterval(intervals);
        playersTurn();
      } else { // continue to play sequence
        playCurrent(game.sequence[counter]);
        counter++;
      }
    }, GAMESPEED);
  }

  function playError() {
    $('.game').removeClass('animate-error');
    setTimeout(function () {
      sound.error.load();
      sound.error.play();
      $('.game').addClass('animate-error');
    }, 100);
  }

  function playCurrent(color) {
    $('.section').removeClass('animate-section');
    setTimeout(function() {
      switch(color) {
        case 'blue':
          sound.blue.load();
          sound.blue.play();
          $('#blue').addClass('animate-section');
          break;
        case 'red':
          sound.red.load();
          sound.red.play();
          $('#red').addClass('animate-section');
          break;
        case 'yellow':
          sound.yellow.load();
          sound.yellow.play();
          $('#yellow').addClass('animate-section');
          break;
        case 'green':
          sound.green.load();
          sound.green.play();
          $('#green').addClass('animate-section');
          break;
      }
    }, 100);
  }

  function togglePower(power) {
    if(power) {
      game.power = true;
    } else {
      game.strictMode = false;
      game.start = false;
      game.power = false;
      reset();
    }
  }

  function toggleStart(start) {
    if(start) {
      game.start = true;
      init();
    } else {
      game.start = false;
    }
  }

  function toggleStrict(strict) {
    game.strictMode = strict ? true : false;
  }

  return {
    init: init,
    togglePower: togglePower,
    toggleStart: toggleStart,
    toggleStrict: toggleStrict
  };
})();

$(document).ready(function() {
  // POWER BUTTON
  $('.switch').on('click', function() {
    if($('.switch').hasClass('move-switch-right')) {
      simonGame.togglePower(false); // turn off
      $('.switch').removeClass('move-switch-right').addClass('move-switch-left');
      $('.red, .yellow').removeClass('red--active yellow--active').prop('disabled', true);
      $('#round').text('');
    } else {
      simonGame.togglePower(true); // turn on
      $('.switch').removeClass('move-switch-left').addClass('move-switch-right');
      $('.red, .yellow').prop('disabled', false);
      $('#round').text('--');
    }
  });

  // STRICT BUTTON
  $('.yellow').on('click', function() {
    if($('.yellow').hasClass('yellow--active')) {
      simonGame.toggleStrict(false); // turn off
      $('.yellow').removeClass('yellow--active');
    } else {
      simonGame.toggleStrict(true); // turn on
      $('.yellow').addClass('yellow--active');
    }
  });

  // START BUTTON
  $('.red').on('click', function() {
    if($('.red').hasClass('red--active')) {
      simonGame.toggleStart(false); // turn off
      $('.red').removeClass('red--active');
      $('#round').text('--');
    } else {
      simonGame.toggleStart(true); // turn on
      $('.red').addClass('red--active');
    }
  });

  // RESTART BUTTON
  $('#restart').on('click', function() {
    $('.modal-backdrop').hide();
    simonGame.init();
  });
});
              
            
!
999px

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