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                  <div class="container">
  <div class="row">
    <div class="col-md-3" style="background-color: #000000;"></div>
    <div class="col-md-12 base drop">
      <div class="controls">
        <h1 class="name">simon<span style="font-size: 50%;"><sup>&#174;</sup></span></h1>
        <div class="control-row">
          <div class="counter">
            COUNTER
            <div class="display"> <div id="display-count" class="display-count">00</div></div>
          </div>
          <div class="start">
            START
            <button class="start-btn" id="start" type="button" onclick="playGame()"></button>
          </div>
          <div class="strict">
            STRICT
            <button class="strict-btn" id="strict-button" onclick="strictBtn()"></button>
            <button class="strict-btn-on" id="strict-button-on" onclick="strictBtnOn()"></button>
          </div>
        </div>
        <div class="control-row">
          <div class="on">ON</div>
          <div class="switch">
            <div id="switch" class="switch-button" onclick="switchBtn()"></div>
            <div id="switchoff" class="switch-button-on" onclick="switchBtnOff()"></div>
          </div>
          <div class="off">OFF</div>
        </div>
      </div>
      <div class="row">
        <div class="col-md-12" id="game">
          <div class="green-btn" id="green-button">
            <img src="http://www.mikemorkes.com/codepen/simon/green_btn_off.png" width="300" height="300" id="btn_0" onclick="btn_click(0)">
          </div>
          <div class="red-btn" id="red-button">
            <img src="http://www.mikemorkes.com/codepen/simon/red_btn_off.png" width="300" height="300" id="btn_1" onclick="btn_click(1)">
          </div>
        </div>
      </div>
      <div class="row">
        <div class="col-md-12">
          <div class="yellow-btn" id="yellow-button">
            <img src="http://www.mikemorkes.com/codepen/simon/yellow_btn_off.png" width="300" height="300" id="btn_2" onclick="btn_click(2)">
          </div>
          <div class="blue-btn" id="blue-button">
            <img src="http://www.mikemorkes.com/codepen/simon/blue_btn_off.png" width="300" height="300" id="btn_3" onclick="btn_click(3)">
          </div>
        </div>
      </div>
    </div>
    <div class="col-md-3"></div>
    <div style="display: none;"><form id="my_form">
                    Round: <input id="seq_len" type="text" size="2">
      </form></div>
  </div>
</div>

            
          
!
            
              @import url(https://fonts.googleapis.com/css?family=Roboto+Slab:700|Roboto:400,700|Roboto+Condensed:400,700);

body { /* background is from https://newevolutiondesigns.com/50-hd-retro-wallpapers */
  background: #7c0704 url('http://www.mikemorkes.com/codepen/simon/retro-stripes-background.jpg') no-repeat fixed bottom center / cover;
  font-family: 'Roboto Condensed', Arial, Helvetica, sans-serif;
}

.base {
background: #000000; /* Old browsers */
background: -moz-linear-gradient(-45deg,  #292a2d 0%, #000000 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(-45deg,  #292a2d 0%,#000000 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(135deg,  #292a2d 0%,#000000 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#292a2d', endColorstr='#000000',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
  margin: 100px auto 0;
  border-radius: 50%;
  width: 600px;
  height: 600px;
  padding: 0 !important;
  box-shadow: inset 4px 4px 20px #666;
}

.controls {
background: #e2e2e2; /* Old browsers */
background: -moz-linear-gradient(-45deg,  #e2e2e2 0%, #dbdbdb 50%, #d1d1d1 51%, #fefefe 100%); /* FF3.6-15 */
background: -webkit-linear-gradient(-45deg,  #e2e2e2 0%,#dbdbdb 50%,#d1d1d1 51%,#fefefe 100%); /* Chrome10-25,Safari5.1-6 */
background: linear-gradient(135deg,  #e2e2e2 0%,#dbdbdb 50%,#d1d1d1 51%,#fefefe 100%); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#e2e2e2', endColorstr='#fefefe',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */

  border-radius: 100%;
  width: 220px;
  height: 220px;
  position: absolute;
  z-index: 1000000;
  top: 188px;
  left: 188px;
  margin: 0;
}

.name {
  font-family: 'Roboto Slab', serif; 
  text-align: center;
  margin: 30px auto 10px;
  font-size: 50px;
}

.control-row {
  width: 220px;
  margin-bottom: 5px;
  float: left;
}

.counter {
  float: left;
  width: 50%;
  text-align: center;
  font-size: 11px;
}

.display {
  width: 60%;
  height: 33px;
  border-radius: 8px;
  background-color: #33050b;
  margin: 5px auto;
  color: #c12900;
  font-family: 'Roboto', sans-serif;
  font-size: 24px;
}

.display-count {
    display: none;
}

.start {
  float: left;
  width: 35px;
  text-align: center;  
  font-size: 11px;  
}

.start-btn {
  border-radius: 100%;
  border: 3px solid #333;
  width: 25px;
  height: 25px;
  background-color: #009341;
  margin: 5px auto 0;
  cursor:pointer;
}

.strict {
  float: left;
  width: 55px;
  text-align: center;  
  font-size: 11px;  
}

.strict-btn {
  border-radius: 100%;
  border: 3px solid #333;
  width: 25px;
  height: 25px;
  background-color: #7c0704;
  margin: 5px auto 0;
  cursor:pointer;
  display: block;
}

.strict-btn-on {
  border-radius: 100%;
  border: 3px solid #333;
  width: 25px;
  height: 25px;
  background-color: #ef0600;
  margin: 5px auto 0;
  cursor:pointer;  
  display: none;
}

.on {
  float: left;
  width: 67px;
  text-align: right;  
  font-size: 11px;  
}

.switch {
  float: left;
  width: 62px;
  text-align: center;  
  background-color: #333;
  margin: 0 10px;
  border-radius: 3px;
  padding: 3px;
}

.switch-button {
  width: 20px;
  height: 20px;
  background-color: #7c0704;
  margin-left: 36px;
  cursor:pointer;  
}

.switch-button-on {
  width: 20px;
  height: 20px;
  background-color: #7c0704;
  cursor:pointer; 
  display: none;
}

.off {
  float: left;
  width: 67px;
  text-align: left;  
  font-size: 11px;  
}

.btn-shadow {
      -webkit-filter: drop-shadow( 0 0 10px #000 );
            filter: drop-shadow( 0 0 10px #000 );
}

.green-btn {
  width: 280px;
  height: 280px;
  margin: 3px 0 10px 5px;
  float: left;
  cursor:pointer;
}

.red-btn {
  width: 280px;
  height: 280px;
  margin: 3px 0 0 10px;
  float: left;
  cursor:pointer;
}

.yellow-btn {
  width: 280px;
  height: 280px;
  margin: 0 0 0 5px;
  float: left;
  cursor:pointer;
}


.blue-btn {
  width: 280px;
  height: 280px;
  border-radius: 0% 10px 100% 10px;
  margin: 0 0 0 10px;
  float: left;
  cursor:pointer;
}

input:focus,
I select:focus,
textarea:focus,
button:focus {
	outline: none !important;
}

            
          
!
            
              // worked from http://codeperspectives.com/front-end/simon-says-sequences/ when I was struggling with working with asymetric programming, but made sure I understood the code (hence the copious inline notes) - and tweaked/improved it. Also renamed functions and variables to make more sense.

// Global
var simon = {};

var strictBoo = false;

// strict, on/off button functions
function strictBtn() {
  document.getElementById("strict-button-on").style.display = "block";
  document.getElementById("strict-button").style.display = "none";  
  strictBoo = true;
}

function strictBtnOn() {
  document.getElementById("strict-button-on").style.display = "none";
  document.getElementById("strict-button").style.display = "block";
  strictBoo = false;
}

function switchBtn() {
  document.getElementById("switch").style.display = "none";
  document.getElementById("switchoff").style.display = "block";
  document.getElementById("display-count").style.display = "block";
  document.getElementById("display-count").innerHTML = "00";
}

function switchBtnOff() {
  document.getElementById("switch").style.display = "block";
  document.getElementById("switchoff").style.display = "none";
  document.getElementById("display-count").style.display = "none";
  gameOver();
}

// set up the button images
function initializebtnImages() {
  simon.imgOff = ["http://www.mikemorkes.com/codepen/simon/green_btn_off.png", "http://www.mikemorkes.com/codepen/simon/red_btn_off.png", "http://www.mikemorkes.com/codepen/simon/yellow_btn_off.png", "http://www.mikemorkes.com/codepen/simon/blue_btn_off.png"];

  simon.imgOn = ["http://www.mikemorkes.com/codepen/simon/green_btn_on.png", "http://www.mikemorkes.com/codepen/simon/red_btn_on.png", "http://www.mikemorkes.com/codepen/simon/yellow_btn_on.png", "http://www.mikemorkes.com/codepen/simon/blue_btn_on.png"];

  simon.imgDelay = 800; // sets up how long light comes on
}

// set up the sounds
function initializeSounds() {
  // win/error tones
  simon.successSound = new Audio("http://www.mikemorkes.com/codepen/simon/sounds/tada.wav");
  simon.failureSound = new Audio("http://www.mikemorkes.com/codepen/simon/sounds/buzzerheavy.wav");
  
  //button tones
  simon.btnSound = [new Audio("https://s3.amazonaws.com/freecodecamp/simonSound4.mp3"),
    new Audio("http://www.mikemorkes.com/codepen/simon/sounds/simonSound3.mp3"),
    new Audio("http://www.mikemorkes.com/codepen/simon/sounds/simonSound2.mp3"),
    new Audio("http://www.mikemorkes.com/codepen/simon/sounds/simonSound1.mp3")
  ];

}


// set up intialization of sequence - this also resets everything between games
function initializeSeq() {
  simon.sequence = new Array(); // get sequence; 0 = green, 1 = red, 2 = yellow, 3 = blue
  for (var i = 0; i < 20; i++) {
    simon.sequence[i] = Math.floor(Math.random() * 4);
  }
  simon.sequenceLength; // track current sequence length  
  simon.btnsPlayed; // track what notes were played
  simon.btnsClicked; // track what notes were clicked by user
  simon.count = 1;
  document.getElementById("display-count").innerHTML = "0" + simon.count; // set display to current round

}

// set up event listener
function initializeListener() {
  document.addEventListener("click", onClick);
}


// plays the current sequence of notes
function playSequence() {
  simon.btnsPlayed = 0;
  simon.btnsClicked = 0;
  simon.intervalSetup = setInterval(function() {
      if (simon.btnsPlayed < simon.sequenceLength) { // compare # of notes played to current sequence length
    	btnPlay(simon.sequence[simon.btnsPlayed]);
    	simon.btnsPlayed = simon.btnsPlayed + 1;
  	} else { // if sequence length, reached, clear the interval
    	clearInterval(simon.intervalSetup);
  	}
  }, 900);
}

// function to turn on light and play note, using i, which is determined by onClick
function turnBtnOn(i, btnImage) {
  simon.btnSound[i].play(); // play sound
  btnImage.src = simon.imgOn[i]; // img source is grabbed from array imgOn
}

// function to switch light off again
function turnBtnOff(i, btnImage) {
  btnImage.src = simon.imgOff[i]; // get img source from array imgOff
}

// function to turn on light and play sound when button should play
function btnPlay(i) {
  var imgID = "btn_" + String(i); // generate btnImage id, i is puled from onClick
  var btnImage = document.getElementById(imgID); // target btnImage element with imgID using var btnImage

  turnBtnOn(i, btnImage); // turn on btnImage and play sound
  setTimeout(function() {
    turnBtnOff(i, btnImage);
  }, simon.imgDelay); // turn off lit btnImage after delay
}

// button press functions
function onClick(evt) {
  var targetID; // this is null until something is assigned to it

  targetID = evt.target.id;
  if (targetID.match("btn_") === null) { // if nothing pressed yet, don't start for loop
    return -1; // program now waits for a button press
  }

  // get target ID # and drop it in i to use later
  var i = targetID.slice(-1);
  i = Number(i);
  if (i == -1) { // nothing has been pressed, so...
    return; // break loop
  }
  
  // otherwise, this function passes on button ID to btnPlay
  btnPlay(i);
  simon.btnsClicked = simon.btnsClicked + 1;
  if (simon.sequence[simon.btnsClicked - 1] === i) { // player pressed correct button
    // see if the sequence is completed
  if (simon.btnsClicked != simon.sequenceLength) {
    return; // this breaks the loop, because player hasn't pressed enough buttons to finish round
  }

  if (simon.btnsClicked < 20) { // if current round isn't last round,
    simon.sequenceLength = simon.sequenceLength + 1; // add another note to sequence
    simon.count++; // bump up counter by 1
    if (simon.count < 10) { // change counter amount
      document.getElementById("display-count").innerHTML = "0" + simon.count;
    } else {
      document.getElementById("display-count").innerHTML = simon.count;
    }
    timer = setTimeout(function() {
      playSequence(); // play sequence
    }, 900);
  } else { // player won
    gameOver(true); // player finished all sequences, so run winner stuff
  }
    
  } else { // player pushed wrong button
    if (strictBoo === true) { // if the strict button is active
      simon.failureSound.play();
      document.getElementById("display-count").innerHTML = "END";
    } else { // if the strict button is inactive
      simon.failureSound.play();
      document.getElementById("display-count").innerHTML = "NO!";
      timer = setTimeout(function() {
        if (simon.count < 10) {
          document.getElementById("display-count").innerHTML = "0" + simon.count;
        } else {
          document.getElementById("display-count").innerHTML = simon.count;
        }
        playSequence(); // play sequence
      }, 900);
    }
  }
}


// tests to see if player won game
function gameOver(playerWon) {
  document.removeEventListener('click', onClick);
  if (playerWon) {
    timer = setTimeout(function() { // run player win sequence
      document.getElementById("display-count").innerHTML = "WIN";
      simon.successSound.play();
    }, 1000);
    timer = setTimeout(function() { // start new game
      playGame();
    }, 1700);

  } else {
    if (strictBoo === true) { // run lose sound and put END in counter
      simon.failureSound.play();
      document.getElementById("display-count").innerHTML = "END";
    }
  }
}

// run the game
function playGame(i) {
  initializeSeq();
  initializeListener();
  console.log(simon.sequence);
  simon.sequenceLength = 1;
  timer = setTimeout(function() {
    playSequence(); // play sequence
  }, 300);
}

// initialize btnImages, sounds, and number of rounds
window.onload = function() {
  initializebtnImages();
  initializeSounds();
};
            
          
!
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