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HTML 

              
                %div{ :align => 'center' }
  .base
    .center
      .controls
        %h1 
          Simon
          %sup ®
        .round-count --
        %p Round
        .on-off
          .on
          .off
          %p Off
          %p On
        .start
        %p Start
        .strict
        .strict-led
        %p Strict
    .simon-row
      .green{ 'data-index' => 0 }
      .red{ 'data-index' => 1 }
    .simon-row
      .yellow{ 'data-index' => 2 }
      .blue{ 'data-index' => 3 }
!

CSS 

              
                body
  background-color: #ffb54b

.color-active
  cursor: pointer
  background: radial-gradient(rgba(255,255,255,0.5), rgba(255,255,255,0))
  
.green
  border-top-left-radius: 100%
  background-color: green
  
.red
  border-top-right-radius: 100%
  background-color: red
  
.yellow
  border-bottom-left-radius: 100%
  background-color: yellow
  
.blue
  border-bottom-right-radius: 100%
  background-color: blue
  
.green, .red, .yellow, .blue
  position: relative
  display: inline-block
  width: 225px
  height: 225px
  z-index: 10

.base
  background-color: #333
  border-radius: 50%
  width: 500px
  height: 500px
  box-shadow: 0 0 15px 0 rgba(0,0,0,1)
  
  .simon-row
    position: relative
    top: 24px
    
.center
  width: 200px
  height: 200px
  background-color: #333
  border-radius: 50%
  position: relative
  top: 150px
  margin-bottom: -200px
  z-index: 15
  
.controls
  background-color: white
  width: 190px
  height: 190px
  border-radius: 50%
  position: relative
  top: -25px
  left: -25px
  font-family: 'Squada One', monospace
  z-index: 5
  border: 25px solid #333
  
h1
  color: #222
  padding: 0
  margin: 0
  display: inline
  position: relative
  left: 33px
  top: 11px
  
  sup
    font-family: monospace
    
.round-count
  position: relative
  display: inline-block
  background-color: #222
  padding: 3px
  border-radius: 3px
  color: #555
  top: 43px
  left: -45px
  font-family: 'Share Tech Mono', monospace
  font-weight: bold
  
p
  position: relative
  top: 43px
  left: -110px
  display: inline-block
  
.on-off
  background-color: #222
  position: relative
  width: 25px
  height: 10px
  top: 20px
  left: 43px
  
  >p:nth-child(3)
    position: relative
    top: -42px
    left: -15px
  
  >p:last-child
    position: relative
    top: -91px
    left: 13px
  
.on, .off
  width: 10px
  height: 10px
  position: relative
  cursor: pointer
    
  
.on
  left: 8px
  display: none
  background-color: green
  
  &:hover
    background-color: darkgreen
  
.off
  display: block
  left: -7px
  background-color: red
  
  &:hover
    background-color: darkred
  
.start
  display: inline-block
  width: 32px
  height: 32px
  background-color: #555
  border-radius: 50%
  position: relative
  top: 60px
  left: -20px
  
p:nth-child(6)
  position: relative
  top: 25px
  left: -54px

.strict
  width: 32px
  height: 32px
  background-color: #555
  border-radius: 50%
  position: relative
  top: 9px
  left: 40px

.strict-led
  width: 8px
  height: 8px
  background-color: #222
  border-radius: 50%
  position: relative
  top: -10px
  left: 67px
  
p:nth-child(9)
  position: relative
  top: -65px
  left: 40px
!

JS 

              
                function SimonGame () {
  this.var = {};
  this.var.start_cycles  = -1;
  this.var.round         = 0;
  this.var.strict        = false;
  this.var.start         = false;
  this.var.sequence      = [];
  this.var.user_sequence = 0;
  
  this.audio = [ new Audio ('https://s3.amazonaws.com/freecodecamp/simonSound1.mp3'),
                 new Audio ('https://s3.amazonaws.com/freecodecamp/simonSound2.mp3'),
                 new Audio ('https://s3.amazonaws.com/freecodecamp/simonSound3.mp3'),
                 new Audio ('https://s3.amazonaws.com/freecodecamp/simonSound4.mp3') ];
 
  this.obj = {};
  this.obj.btn       = [ $('.green'), $('.red'), $('.yellow'), $('.blue') ];
  this.obj.start     = $('.start');
  this.obj.strict    = $('.strict');
  this.obj.strictLed = $('.strict-led');
  this.obj.round     = $('.round-count');
  this.obj.on        = $('.on');
  this.obj.off       = $('.off');

  /* functions */
  var self = this;
  
  this.on = function () {
    self.var.start_cycles = 0;
    var int_id = setInterval (function () {
      self.obj.off.hide ();
      self.obj.on.show ();
      
      if ( self.var.start_cycles == 6 ) {
           self.var.start_cycles = -1;
        
           self.var.start_cycles  = -1;
           self.var.round         = 0;
           self.var.strict        = false;
           self.var.start         = false;
           self.var.sequence      = [];
           self.var.user_sequence = 0;
        
           self.obj.start.css ({ 'background-color': 'red', 'cursor': 'pointer' });
           self.obj.strict.css ({ 'background-color': 'yellow', 'cursor': 'pointer' });
        
           self.obj.start.bind ('click', self.start);
           self.obj.strict.bind ('click', function () {
              self.var.strict = self.var.strict === false;
             
              if ( self.var.strict )
                   self.obj.strictLed.css ({ 'background-color': 'red' });
              else self.obj.strictLed.css ({ 'background-color': '#222' });
           });
        
           clearInterval (int_id);
           return;
      }
      
      var color = ( self.var.start_cycles % 2 ) ? '#e00' : '#400';
      self.obj.round.css ({ 'background-color': '#400', 'color': color });
      self.var.start_cycles++;
    }, 500);
  };

  this.off = function () {
    var int_id = setInterval (function () {
       if ( self.var.start_cycles == -1 ) {
            self.obj.round.css ({ 'background-color': '#222', 'color': '#555' }); 

            self.var.round        = 0;
            self.var.strict       = false;
            self.var.start        = false;
            self.var.sequence     = []; 
          
            self.obj.on.hide ();
            self.obj.off.show ();
            self.obj.round.text ("--");
            self.obj.strictLed.css ({ 'background-color': '#222' });  
            self.obj.start.css ({ 'background-color': '#555', 'cursor': 'default' });
            self.obj.strict.css ({ 'background-color': '#555', 'cursor': 'default' });
          
            self.obj.start.unbind ('click');
            self.obj.strict.unbind ('click');
         
            for ( var j = 0; j < 4; ++j ) {
              self.obj.btn[j].unbind ('click');
              self.obj.btn[j].css ({ 'cursor': 'default' });
              self.obj.btn[j].removeClass ('color-active');
              self.audio[j].pause ();
              self.audio[j].currentTime = 0;
            }
         
            clearInterval (int_id);
       }
    }, 100);
  };
  
  this.start = function () {
    self.var.sequence = [];
    self.var.sequence.push (Math.round (Math.random () * 3));
 
    self.var.round = 1;   
    for ( var j = 0; j < 4; ++j ) {
          self.obj.btn[j].unbind ('click');
          self.obj.btn[j].css ({ 'cursor': 'default' });
          self.obj.btn[j].removeClass ('color-active');
          self.audio[j].pause ();
          self.audio[j].currentTime = 0;
    }
    self.play_sequence ();
  };
  
  this.display = function (n) { 
      if ( n < 10 ) return '0' + n;
      
      return n;
  };
                               
  this.play_sequence = function () {    
    self.obj.round.text (self.display (self.var.round));
    var curr_sequence_pos = 0;
    
    var int_id = setInterval (function () {
      if ( curr_sequence_pos >= self.var.sequence.length ) {
           if ( curr_sequence_pos == self.var.sequence.length )
                self.obj.btn[self.var.sequence[curr_sequence_pos - 1]].removeClass ('color-active');
           
           self.var.user_sequence = 0;
           for ( var j = 0; j < 4; ++j ) {
                 self.obj.btn[j].css ({ 'cursor': 'pointer' });
                 self.obj.btn[j].bind ('click', self.btn_clicked);
           }
        
           clearInterval (int_id);
           return;
      }
      
      if ( curr_sequence_pos > 0 ) {
           self.obj.btn[self.var.sequence[curr_sequence_pos - 1]].removeClass ('color-active');
           self.audio[self.var.sequence[curr_sequence_pos - 1]].pause ();
           self.audio[self.var.sequence[curr_sequence_pos - 1]].currentTime = 0;
      }
      
      var curr_index = self.var.sequence[curr_sequence_pos];
      setTimeout (function () {
        self.audio[curr_index].play ();
        self.obj.btn[curr_index].addClass ('color-active');
      }, 100);
      
      curr_sequence_pos++;
    }, 700);
  };
  
  this.btn_clicked = function () {
    var index = $(this).data ('index');
    
    self.obj.btn[index].addClass ('color-active');
    self.audio[index].play ();
    
    setTimeout (function () {
      self.obj.btn[index].removeClass ('color-active');
      
      if ( self.var.sequence[self.var.user_sequence] != index ) {
           self.var.user_sequence = 0;
           for ( var j = 0; j < 4; ++j ) {
                 self.obj.btn[j].css ({'cursor': 'default'});
                 self.obj.btn[j].unbind ('click');
           }
        
           var blink = 0;
           var int_id = setInterval (function () {
             if ( blink == 7 ) {
                  if ( self.var.strict ) 
                       self.start ();
                  else self.play_sequence ();
                  
                  self.obj.round.text (self.display (self.var.round));
               
                  clearInterval (int_id);
                  return;
             }
             
             self.obj.round.text ((blink % 2) ? '!!' : '--' );
             blink++;
           }, 500);
      }
      else {
           self.var.user_sequence++;
           if ( self.var.user_sequence == self.var.sequence.length ) {
                self.var.user_sequence = 0;
        
                for ( var j = 0; j < 4; ++j ) {
                      self.obj.btn[j].css ({'cursor': 'default'});
                      self.obj.btn[j].unbind ('click');
                }
        
                self.var.sequence.push (Math.round (Math.random () * 3));
 
                self.var.round++;   
                if ( self.var.round > 20 ) {
                     var blink = 0;
                     var int_id = setInterval (function () {
                       if ( blink == 7 ) {
                            self.start ();
                  
                            self.obj.round.text (self.display (self.var.round));
               
                            clearInterval (int_id);
                            return;
                       }
                       
                       self.obj.round.text ((blink % 2) ? '**' : '--' );
                       blink++;
                     }, 500);
                }
                else self.play_sequence ();
           }
      }
    }, 500);
  };
  
  /* events */
  this.obj.off.click (this.on);
  this.obj.on.click (this.off);
}

$(document).ready (function () {
  var game = new SimonGame ();  
  
});
!
999px

Console