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HTML

              
                <!-- Press Start to play -->
<div class="simon">
  <div class="pad green"></div>
  <div class="pad red"></div>
  <div class="pad yellow"></div>
  <div class="pad blue"></div>
  <div class="center">
    <div class="center-inner">
      <div class="brand">Simon</div>
      <div id="controls">

        <div id="start">
          <div class="value"></div>
          <div class="label">start</div>
        </div>
        <div id="steps">
          <div id="display">
            <div class="digits">
              <div id="digit-1">
                <span class="d1"></span>
                <span class="d2"></span>
                <span class="d3"></span>
                <span class="d4"></span>
                <span class="d5"></span>
                <span class="d6"></span>
                <span class="d7"></span>
              </div>
              <div id="digit-2">
                <span class="d1"></span>
                <span class="d2"></span>
                <span class="d3"></span>
                <span class="d4"></span>
                <span class="d5"></span>
                <span class="d6"></span>
                <span class="d7"></span>
              </div>
            </div>
          </div>
          <div class="label">count</div>
        </div>
        <div id="strict">
          <div class="value">
            <div class="switch">
              <input id="strict-mode" type="checkbox">
              <label></label>
            </div>
          </div>
          <div class="label">strict</div>
        </div>
      </div>
    </div>
  </div>
</div>
<audio class="green-sound" src="https://s3.amazonaws.com/freecodecamp/simonSound1.mp3"></audio>
<audio class="red-sound" src="https://s3.amazonaws.com/freecodecamp/simonSound2.mp3"></audio>
<audio class="yellow-sound" src="https://s3.amazonaws.com/freecodecamp/simonSound3.mp3"></audio>
<audio class="blue-sound" src="https://s3.amazonaws.com/freecodecamp/simonSound4.mp3"></audio>
              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Candal);

$pad-size: 175px;
$pad-spacing: 5px;
$center-size: 155px;
$metal: #2c3e50;
$label: #ecf0f1;
$red: #c0392b;
$yellow: rgb(195, 195, 15);
$green: #27ae60;
$blue: #2980b9;
$width: $pad-size*2 + $pad-spacing*4;
$height: $pad-size*2 + $pad-spacing*4;

body {
  position: absolute;
  width: 100%;
  top: 50%;
  margin-top: -($height+20)/2;
}

div:focus {
  outline: 0;
}

div.simon {
  position: relative;
  width: $width;
  height: $height;
   margin: 0 auto;
  background: $metal;
  font-size: 0;
  border-radius: 100%;
  padding: 10px;

  > .pad {
    padding: 0;
    margin: $pad-spacing;
    display: inline-block;
    border-radius: 0;
    width: $pad-size;
    height: $pad-size;
    z-index: -2;
  }
  > .red {
    background: $red;
    border-top-right-radius: 100%;
  }

  > .blue {
    background: $blue;
    border-bottom-right-radius: 100%;
  }

  > .yellow {
    background: $yellow;
    border-bottom-left-radius: 100%;
  }

  > .green {
    background: $green;
    border-top-left-radius: 100%;
  }

  .center {
    background: $metal;
    text-align: center;
    color: white;
    width: $center-size;
    height: $center-size;
    position: relative;
    z-index: 10;
    display: block;
    padding: $pad-spacing*2;
    left: $width/2 - $center-size/2 - $pad-spacing*2;
    top: -$height/2 - $center-size/2 - $pad-spacing*2;
    border-radius: 50%;

    .center-inner {
      width: $center-size;
      height: $center-size;
      background: $label;
      border-radius: 50%;

      > .brand {
        font-family: 'Candal', sans-serif;
        padding-top: 26px;
        color: $metal;
        font-size: 36px;
        font-weight: 900;
        display: block;
      }

      #controls {
        .label {
          font-size: 12px;
          color: black;
        }
        > div {
          display: inline-block;
          padding: 0px;
        }

        > #steps {
          // Shown below, to keep code clean
        }

        > #start {
          padding: 5px;

          .value {
            margin: 0 auto;
            margin-bottom: 15px;

            position: relative;
            color: #FFF;
            display: block;
            border-radius: 100%;
            border: solid 1px #D94E3B;
            background: #cb3b27;
            width: 16px;
            height: 16px;
            box-shadow: 0px 5px 0px #84261a;

            &:active {
              box-shadow: 0px 2px 0px #84261a;
              position: relative;
              top: 5px;
            }
          }
        }
        > #strict {
          padding: 5px;
          .value {

          }
        }
      }
    }

  }

}

// Switch
// from: https://tympanus.net/codrops/2012/09/13/button-switches-with-checkboxes-and-css3-fanciness/
.switch {
  position: relative;
  width: 14px;
  height: 30px;
  margin: 0 auto 5px;
  background: black;
  opacity: 0.5;

  input {
    display: block;
    margin: 0 auto 5px;
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 100;
    opacity: 0;
    cursor: pointer;

    &:checked ~ label { /* Button */
      background: #cbc7bc;
      box-shadow: inset 0 1px 0 white,
      0 0 0 1px #999,
      0 0 5px 1px rgba(0, 0, 0, 0.2),
      0 2px 0 rgba(255, 255, 255, 0.6),
      inset 0 10px 1px #e5e5e5,
      inset 0 11px 0 rgba(255, 255, 255, 0.5),
      inset 0 -45px 3px #ccc;
    }
  }

  label {
    display: block;
    width: 100%;
    height: 100%;
    position: relative;
    border-radius: 5px;
    background: #d2cbc3;
    box-shadow: inset 0 1px 0 white,
    0 0 0 1px #999,
    0 0 5px 1px rgba(0, 0, 0, 0.2),
    inset 0 -10px 0 #aaa,
    0 2px 0 rgba(255, 255, 255, 0.1),
    inset 0 45px 3px #e0e0E0,
    0 8px 6px rgba(0, 0, 0, 0.18);
  }
}

/**
  CSS Digits for our counter.
  from: http://tutorialzine.com/2013/06/digital-clock/
  **/

$digit-width: 20px;
$digit-height: 36px;
$digit-border-width: 4px;
$digit-section-margin: 2px;

#display {
  background: #000000;
  padding: 2px;

  .digits {
    font-size: 0px;

    div {
      text-align: left;
      position: relative;
      width: $digit-width;
      height: $digit-height;
      display: inline-block;
      margin: 2px;

      span {
        opacity: 0.3;
        position: absolute;
        background: red;
        border-color: red;

        // used for the triangle bits that make it look digital
        &::before, &::after {
          content: '';
          position: absolute;
          width: 0;
          height: 0;
          border: 5px solid transparent;
        }

      }
    }

  }
}

// digit pieces

// *******************
// * **    TOP    ** *
// *   **       **   *
// *    **     **    *
// *      ** **      *
// * Left   *  Right *
// *      ** **      *
// *    **     **    *
// *   **       **   *
// * **  Bottom   ** *
// *******************

#display .digits .d1 {
  height: $digit-border-width;
  width: $digit-width - $digit-border-width*2 - 2*$digit-section-margin;
  top: 0;
  left: $digit-border-width + $digit-section-margin;
  &::before {
    border-width: 0 $digit-border-width $digit-border-width 0;
    border-right-color: inherit;
    left: -$digit-border-width;

  }
  &::after {
    border-width: 0 0 $digit-border-width $digit-border-width;
    border-left-color: inherit;
    right: -$digit-border-width;
  }
}

#display .digits .d2 {
  height: $digit-border-width;
  width: $digit-width - $digit-border-width*2 - 2*$digit-section-margin;
  top: $digit-height/2 - $digit-border-width/2;
  left: $digit-border-width + $digit-section-margin;
  &::before {
    border-width: $digit-border-width/2 $digit-border-width/2 $digit-border-width/2 0;
    border-right-color: inherit;
    left: -$digit-border-width/2;
  }
  &::after {
    border-width: $digit-border-width/2 0 $digit-border-width/2 $digit-border-width/2;
    border-left-color: inherit;
    right: -$digit-border-width/2;
  }
}

#display .digits .d3 {
  height: $digit-border-width;
  width: $digit-width - $digit-border-width*2 - 2*$digit-section-margin;
  bottom: 0;
  left: $digit-border-width + $digit-section-margin;
  &::before {
    border-width: $digit-border-width $digit-border-width 0 0;
    border-right-color: inherit;
    left: -$digit-border-width;

  }
  &::after {
    border-width: $digit-border-width 0 0 $digit-border-width;
    border-left-color: inherit;
    right: -$digit-border-width;
  }
}

#display .digits .d4 {
  height: ($digit-height - 3*$digit-border-width) / 2;
  width: $digit-border-width;
  top: $digit-border-width;
  left: 0;
  &::before {
    border-width: 0 $digit-border-width $digit-border-width 0;
    border-bottom-color: inherit;
    top: -$digit-border-width;

  }
  &::after {
    border-width: $digit-border-width/2 $digit-border-width 0 0;
    border-top-color: inherit;
    bottom: -$digit-border-width/2;
  }
}

#display .digits .d5 {
  height: ($digit-height - 3*$digit-border-width) / 2;
  width: $digit-border-width;
  top: $digit-border-width;
  right: 0;
  &::before {
    border-width: 0 0 $digit-border-width $digit-border-width;
    border-bottom-color: inherit;
    top: -$digit-border-width;

  }
  &::after {
    border-width: $digit-border-width/2 0 0 $digit-border-width;
    border-top-color: inherit;
    bottom: -$digit-border-width/2;
  }
}

#display .digits .d6 {
  height: ($digit-height - 3 * $digit-border-width) / 2;
  width: $digit-border-width;
  bottom: $digit-border-width;
  left: 0;
  &::before {
    border-width: 0 $digit-border-width $digit-border-width / 2 0;
    border-bottom-color: inherit;
    top: -$digit-border-width/2;

  }
  &::after {
    border-width: $digit-border-width $digit-border-width 0 0;
    border-top-color: inherit;
    bottom: -$digit-border-width;
  }
}

#display .digits .d7 {
  height: ($digit-height - 3*$digit-border-width) / 2;
  width: $digit-border-width;
  bottom: $digit-border-width;
  right: 0;
  &::before {
    border-width: 0 0 $digit-border-width/2 $digit-border-width;
    border-bottom-color: inherit;
    top: -$digit-border-width/2;

  }
  &::after {
    border-width: $digit-border-width 0 0 $digit-border-width;
    border-top-color: inherit;
    bottom: -$digit-border-width;
  }
}

// Which sections to turn on
// zero
#display .digits div.zero .d1,
#display .digits div.zero .d3,
#display .digits div.zero .d4,
#display .digits div.zero .d5,
#display .digits div.zero .d6,
#display .digits div.zero .d7 {
  opacity: 1;
}

// one
#display .digits div.one .d5,
#display .digits div.one .d7 {
  opacity: 1;
}

// two
#display .digits div.two .d1,
#display .digits div.two .d2,
#display .digits div.two .d3,
#display .digits div.two .d5,
#display .digits div.two .d6 {
  opacity: 1;
}

// three
#display .digits div.three .d1,
#display .digits div.three .d2,
#display .digits div.three .d3,
#display .digits div.three .d5,
#display .digits div.three .d7 {
  opacity: 1;
}

// four
#display .digits div.four .d2,
#display .digits div.four .d4,
#display .digits div.four .d5,
#display .digits div.four .d7 {
  opacity: 1;
}

// five
#display .digits div.five .d1,
#display .digits div.five .d2,
#display .digits div.five .d3,
#display .digits div.five .d4,
#display .digits div.five .d7 {
  opacity: 1;
}

// six
#display .digits div.six .d1,
#display .digits div.six .d2,
#display .digits div.six .d3,
#display .digits div.six .d4,
#display .digits div.six .d6,
#display .digits div.six .d7 {
  opacity: 1;
}

// seven
#display .digits div.seven .d1,
#display .digits div.seven .d5,
#display .digits div.seven .d7 {
  opacity: 1;
}

// eight
#display .digits div.eight .d1,
#display .digits div.eight .d2,
#display .digits div.eight .d3,
#display .digits div.eight .d4,
#display .digits div.eight .d5,
#display .digits div.eight .d6,
#display .digits div.eight .d7 {
  opacity: 1;
}

// nine
#display .digits div.nine .d1,
#display .digits div.nine .d2,
#display .digits div.nine .d4,
#display .digits div.nine .d5,
#display .digits div.nine .d7 {
  opacity: 1;
}

// left W
#display .digits div.win-left .d3,
#display .digits div.win-left .d4,
#display .digits div.win-left .d6,
#display .digits div.win-left .d7 {
  opacity: 1;
}

// right W
#display .digits div.win-right .d3,
#display .digits div.win-right .d5,
#display .digits div.win-right .d6,
#display .digits div.win-right .d7 {
  opacity: 1;
}

              
            
!

JS

              
                var brighten = 60;

var Color = {
    red: ".red", blue: ".blue", green: ".green", yellow: ".yellow",
    isColor: function (value) {
        for (var k in this) {
            if (!this.hasOwnProperty(k)) continue;
            if (this[k] === value) {
                return true;
            }
        }
        return false;
    }
};

// This whole command thing wasn't really necessary, I just wanted to experiment
var Command = function (execute, undo, value) {
    this.execute = execute;
    this.undo = undo;
    this.value = value;
};

var press = function (value) {
    var originalColor = $(value).css("background");
    var lightColor = tintRGB(originalColor, brighten);
    console.log("LIGHTEN: " + originalColor + "transform to -> " + lightColor);
    $(value).css("background", lightColor);
    $(value).css("box-shadow", "0px 0px 5px #fff");

    $(value + "-sound").trigger('load');
    $(value + "-sound").trigger('play');

    return value;
};

var release = function (value) {
    var originalColor = $(value).css("background");
    var darkColor = tintRGB(originalColor, -brighten);
    console.log("DARKEN: " + originalColor + "transform to -> " + darkColor);
    $(value).css("background", darkColor);
    $(value).css("box-shadow", "none");

    return value;
};

var PressCommand = function (value) {
    return new Command(press, release, value)
};


var Simon = function () {
    var current = "";
    var commands = [];

    return {
        execute: function (command) {
            current = command.execute(command.value);
            commands.push(command);
        },
        undo: function () {
            var command = commands.pop();
            if (command === undefined) {
                current = "";
            } else {
                current = command.undo(command.value);
            }
        },
        getCurrentValue: function () {
            return current;
        },
        undoAll: function () {
            while (commands.length > 0) {
                this.undo();

            }
        }
    }
};

// Command handler
var curMove = 0;
var simon = new Simon();
var moves = [];
var speed = 900;
var showingMoves = false;
var gameStart = false;

// Player Controls
$(".pad").mousedown(function () {

    if (!showingMoves && gameStart) {
        var colorName = "." + $(this).attr('class').split(' ')[1];


        if (moves[curMove] === colorName) {
            // check if the move was correct
            simon.execute(new PressCommand(colorName));
            curMove++;
        } else {
            simon.execute(new PressCommand(".yellow"));
            simon.execute(new PressCommand(".red"));
            simon.execute(new PressCommand(".blue"));
            simon.execute(new PressCommand(".green"));


            // The player made a a mistake, so reset and show again
            setTimeout(function () {


                simon.undoAll();


                this.setTimeout(function () {
                    if ($("#strict-mode").prop('checked')) {
                        restart();
                    } else {
                        showMoves();
                        curMove = 0;
                    }
                }, 300);


            }, 500);
        }

        return false;
    }
});

$(document).mouseup(function () {

    function playerMove() {
        return !showingMoves && Color.isColor(simon.getCurrentValue()) && gameStart;
    }

    if (playerMove()) {
        simon.undo();
        if (curMove === moves.length) {
            if (moves.length === 20) {
                // WINNER
                $("#digit-1").attr("class", "win-left");
                $("#digit-2").attr("class", "win-right");
            } else {
                // All moves in current sequence input correctly, add another move and show
                curMove = 0;
                showingMoves = true;
                setTimeout(function () {
                    addMove();
                    showMoves();
                }, 1000);
            }
        }
    }
});

function restart() {
    curMove = 0;
    moves = [];
    speed = 900;
    showingMoves = false;
    simon.undoAll();
    $("#digit-1").attr("class", "");
    $("#digit-2").attr("class", "");

    gameStart = true;
    addMove();
    showMoves();
}

$("#start").find(".value").click(function () {
    if (!showingMoves) {
        restart();
    }
});

function showMoves() {
    showingMoves = true;
    var i = 0;
    simon.execute(new PressCommand(moves[i]));

    // Turn off and show next move
    (function myLoop() {
        setTimeout(function () {
            simon.undo();
            i++;
            if (i < moves.length) {
                simon.execute(new PressCommand(moves[i]));
                myLoop(i);
            } else {
                showingMoves = false;
            }
        }, speed)
    })();
}

function addMove() {
    moves.push(randomMove());
    setDisplay(moves.length);
    if (moves.length === 5) {
        speed = 600;
    }

    if (moves.length === 9) {
        speed = 400;
    }

    if (moves.length === 13) {
        speed = 200;
    }
}

function setDisplay(value) {
    var numbers = "zero one two three four five six seven eight nine".split(" ");
    value = value.toString();

    if (value.length == 2) {
        $("#digit-1").attr("class", numbers[value.charAt(0)]);
        $("#digit-2").attr("class", numbers[value.charAt(1)]);
    }
    else {
        $("#digit-2").attr("class", numbers[value]);
    }
}


// Utility functions
function tintRGB(color, amount) {
    var parts = color.split(",");
    var digit = /\d+/;

    for (var part = 0; part < parts.length; part++) {
        var value = parseInt(parts[part].match(digit));
        parts[part] = clamp(value + amount, 0, 255);
    }

    return "rgb(" + parts.join(",") + ")";
}

function clamp(num, min, max) {
    return num < min ? min : num > max ? max : num;
}

function random(start, end) {
    return Math.floor((Math.random() * end) + start);
}
function randomMove() {
    return Color[Object.keys(Color)[random(0, 4)]];
}
              
            
!
999px

Console