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HTML

              
                <div id="container">
	<div id="green" class="quarter green" onmousedown="display.playerDown('green')" onmouseup="display.playerUp('green')" onclick="game.player(this)">
	</div>
	<div id="red" class="quarter red" onmousedown="display.playerDown('red')" onmouseup="display.playerUp('red')" onclick="game.player(this)">
	</div>
	<div id="yellow" class="quarter yellow" onmousedown="display.playerDown('yellow')" onmouseup="display.playerUp('yellow')" onclick="game.player(this)">
	</div>
	<div id="blue" class="quarter blue" onmousedown="display.playerDown('blue')" onmouseup="display.playerUp('blue')" onclick="game.player(this)">
	</div>
	<div id="centerCircle">
		<h2>Simon</h2>
		<div id="count">
			<div id="countDisplay">
				<p id="display">- -</p>
			</div>
		</div>
		<div id="start" onclick="game.startGame()">
		</div>
		<div id="strict" onclick="display.strict()"></div>
		<div id="strictOn">
		</div>
		<div id="content">
			<p>Count</p>
			<p>Start</p>
			<p>Strict</p>
		</div>
		<div id="power" onclick="display.powerOn()">
			<div id="powerSwitch">
			</div>
			<p>OFF</p>
			<p>ON</p>
		</div>
	</div>
</div>
<audio id="greenAudio">
  
  <source src="https://s3.amazonaws.com/freecodecamp/simonSound1.mp3" type="audio/mpeg">
  Your browser does not support the audio element.
</audio>
<audio id="redAudio">
  
  <source src="https://s3.amazonaws.com/freecodecamp/simonSound2.mp3" type="audio/mpeg">
  Your browser does not support the audio element.
</audio>
<audio id="yellowAudio">
  
  <source src="https://s3.amazonaws.com/freecodecamp/simonSound3.mp3" type="audio/mpeg">
  Your browser does not support the audio element.
</audio>
<audio id="blueAudio">
  
  <source src="https://s3.amazonaws.com/freecodecamp/simonSound4.mp3" type="audio/mpeg">
  Your browser does not support the audio element.
</audio>

              
            
!

CSS

              
                @import url(https://fonts.googleapis.com/css?family=Patrick+Hand);
@import url(https://fonts.googleapis.com/css?family=Iceberg);

body {
	background-color: #deb887;
}

#container {
	margin: 0 auto;
	height: 500px;
	width: 500px;
	position: relative;
	background-color: #403E3B;
	border-radius: 50%;
}
.quarter {
	height: 220px;
	width: 220px;
}
#centerCircle {
	height: 250px;
	width: 250px;
	background-color: #ffffff;
	border: 15px solid #403E3B;	
	border-radius: 50%;
	position: relative;
	z-index: 10;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);	
}
#centerCircle h2 {
	position: absolute;    
    top: 0%;
    width: 100%;
    text-align: center;  
		font-family: "Patrick Hand";
		font-size: 3em;
}

.green {
	background-color: #239023; 	
	border-top-left-radius: 250px; 
	float: left;
	border: 15px solid #403E3B;	
}

.red {
	background-color: #800000;	
	float: right;	
	border-top-right-radius: 250px; 
	border: 15px solid #403E3B;	
}

.yellow {
	background-color: #b3b300;
	float: left;	
	border-bottom-left-radius: 250px;		border: 15px solid #403E3B;	
}

.blue {
	background-color: #003399;
	float: right;	
	border-bottom-right-radius: 250px;
	border: 15px solid #403E3B;	
}
#count {
	position: absolute;
	height: 40px;
	width: 50px;
	background-color: #330000;
	border: 5px solid #403e3b;
	border-radius: 10px;
	top: 50%;
	left: 10%;
}



#countDisplay {
	position: absolute;
	font-family: "IceBerg";
	font-size: 1.5em;
	top: -40%;
	left: 20%;
	color: #ff4d4d;
	width: 50px;
}

#start {
	position: absolute;
	height: 20px;
	width: 20px;
	border-radius: 20px;
	background-color: red;
	border: 3px solid #403e3b;
	top: 58%;
	left: 45%;
}

#start:active {
	transform: translateY(2px);
}

#strict {
	position: absolute;
	height: 20px;
	width: 20px;
	border-radius: 20px;
	background-color: yellow;
	border: 3px solid #403e3b;
	top: 58%;
	left: 65%;
}
#strict:active {
	transform: translateY(2px);
}

#strictOn {
	position: absolute;
	height: 10px;
	width: 10px;
	border: 1px solid #403e3b;
	background-color: black;
	border-radius: 10px;
	top: 50%;
	left: 67.5%;
}
#content p:nth-child(1){
	position: absolute;
	left: 13%;
	top: 64%;
	}
#content p:nth-child(2){
	position: absolute;
	left: 43%;
	top: 64%;
	}
#content p:nth-child(3){
	position: absolute;
	left:  63%;
	top: 64%;
	}

#power {
	position: absolute;
	height: 20px;
	width: 60px;
	border-radius: 5px;
	background-color: black;
	border: 3px solid #403e3b;
	top: 80%;
	left: 38%;
}

#powerSwitch {
	position: absolute;
	height: 16px;
	width: 25px;
	border-radius: 5px;
	background-color: blue;
	border: 1px solid #403e3b;
	top: 5%;
	left: 1%;
}

#power p:nth-child(2) {
	position: absolute;
	left: -60%;
	top: -70%;
	font-size: .9em;
}

#power p:nth-child(3) {
	position: absolute;
	left: 120%;
	top: -70%;
	font-size: .9em
		
}

              
            
!

JS

              
                var colors = ["green", "red", "yellow", "blue"];
var clrArr = []; // will be array of the 20 different random colors
var power; // game on or off
var gameStarted = false; //trying to make it so player cant do mouse clicks before players turn
var round = 0;
var error = null;
var turnNumbers = document.getElementById("countDisplay");
var displayA = document.getElementById("display");
var powerSwitch = document.getElementById("powerSwitch");
var strictEnabled = "off";
var myVar;
powerSwitch.style.left = "1%";
displayA.style.visibility = "hidden";

var audio = {
	greenAudio: document.getElementById("greenAudio"),
	redAudio: document.getElementById("redAudio"),
	yellowAudio: document.getElementById("yellowAudio"),
	blueAudio: document.getElementById("blueAudio")
}

var display = {
		green: document.getElementById("green"),
		red: document.getElementById("red"),
		yellow: document.getElementById("yellow"),
		blue: document.getElementById("blue"),

		powerOn: function() {
			if (powerSwitch.style.left === "1%") {

				powerSwitch.style.left = "50%";
				displayA.style.visibility = "visible";
				displayA.innerHTML = "- -";
				power = "on";
				clrArr = [];
				cpArr = [];
				playerArr = [];

				this.rotate();

			} else {
				powerSwitch.style.left = "1%";
				displayA.style.visibility = "hidden";
				power = "off";
				clrArr = [];
				playerArr = [];
				round = 0;
				gameStarted = false;
				var highestTimeoutId = setTimeout(";"); // clears out all timeouts.
				for (var i = 0; i < highestTimeoutId; i++) {
					clearTimeout(i);
				}
				//clearTimeout(display.flash);

			}
		},
		strict: function() {
			var strictOn = document.getElementById("strictOn");
			if (power === "on") {
				if (strictEnabled === "off") {
					strictEnabled = "on";
					strictOn.style.backgroundColor = "red";
				} else {
					strictEnabled = "off";
					strictOn.style.backgroundColor = "black";
				}
			}
		},

		rotate: function() { // flahing of all colors when powering on.
			var timeOut;
			this.down('green');
			timeOut = window.setTimeout(this.up, 500, 'green');
			this.down('red');
			timeOut = window.setTimeout(this.up, 500, 'red');
			this.down('yellow');
			timeOut = window.setTimeout(this.up, 500, 'yellow');
			this.down('blue');
			timeOut = window.setTimeout(this.up, 500, 'blue');
		},
		playerDown: function(objColor) {
			if (game.turn === "player") {
				this.down(objColor);
			}
		},

		playerUp: function(objColor) {
			if (game.turn === "player") {
				this.up(objColor);
			}
		},

		down: function(objColor) { // highlight butons
			if (error === null) {
				if (objColor === "green") {
					green.style.backgroundColor = "#5bd75b";
					audio.greenAudio.play();
				}
				if (objColor === "red") {
					red.style.backgroundColor = "#e60000";
					audio.redAudio.play();
				}
				if (objColor === "yellow") {
					yellow.style.backgroundColor = "#ffff66";
					audio.yellowAudio.play();
				}
				if (objColor === "blue") {
					blue.style.backgroundColor = "#3377ff";
					audio.blueAudio.play();
				}
			}
		},
		up: function(objColor) { // set buttons back to original color
			if (error === null) {
				if (objColor === "green") {
					green.style.backgroundColor = "#239023";
				}
				if (objColor === "red") {
					red.style.backgroundColor = "#800000";
				}
				if (objColor === "yellow") {
					yellow.style.backgroundColor = "#b3b300";
				}
				if (objColor === "blue") {
					blue.style.backgroundColor = "#003399";
				}
			}
		},

		flash: function(objColor) { // animate computer button push

			var timeOut;
			this.down(objColor);
			timeOut = window.setTimeout(this.up, 300, objColor);
		},
		incorrect: function() {
			displayA.innerHTML = "! !";
			setTimeout(function() {
				displayA.style.visibility = "hidden";
			}, 100);
			setTimeout(function() {
				displayA.style.visibility = "visible";
			}, 150);
			displayA.innerHTML = "! !";
			setTimeout(function() {
				displayA.style.visibility = "hidden";
			}, 200);
			setTimeout(function() {
				displayA.style.visibility = "visible";
			}, 250);
			displayA.innerHTML = "! !";
			setTimeout(function() {
				displayA.style.visibility = "hidden";
			}, 300);
			setTimeout(function() {
				displayA.style.visibility = "visible";
			}, 350);
			displayA.innerHTML = "! !";
			setTimeout(function() {
				displayA.innerHTML = round;
			}, 700);
		},

		win: function() {
			turnNumbers.style.left = "15%"
			displayA.innerHTML = "WIN";
			setTimeout(function() {
				displayA.style.visibility = "hidden";
			}, 100);
			setTimeout(function() {
				displayA.style.visibility = "visible";
			}, 150);
			displayA.innerHTML = "WIN";
			setTimeout(function() {
				displayA.style.visibility = "hidden";
			}, 200);
			setTimeout(function() {
				displayA.style.visibility = "visible";
			}, 250);
			displayA.innerHTML = "WIN";
			setTimeout(function() {
				displayA.style.visibility = "hidden";
			}, 300);
			setTimeout(function() {
				displayA.style.visibility = "visible";
			}, 350);
			displayA.innerHTML = "WIN";
			setTimeout(function() {
				displayA.innerHTML = round;
			}, 700);
			setTimeout(function() {
				turnNumbers.style.left = "40%"
			}, 700);

		}
	} //end display obj

var game = {
	turn: "computer",
	cpArr: [], // will hold computer button selections
	playerArr: [], // will hold player button selections
	startGame: function() {
		if (power === "on" && gameStarted === false) {
			gameStarted = true;
			this.createArr(); // create array of 20 random colors.
			displayA.innerHTML = round; // show round in the displaybox.
			turnNumbers.style.left = "40%"; // adjust the display to be centered for only one number		
			this.computer(); // start the computer turn
		}
	},
	setPlayerTurn: function() {
		this.turn = "player";
	},
	computer: function() {
		if (round < 20) {
			round++;

			displayA.innerHTML = round;
			this.cpArr = clrArr.slice(0, round); // as round increases cpArr increases also.

			this.iterate();
		}

		//this.setPlayerTurn();
		this.playerArr = []; // clear playerArr in order to check for errors

	},

	player: function(obj) {
		error = null; // allows game to continue after an error by the player.
		if (this.turn === "player") {
			this.playerArr.push(obj.id);
			this.check(this.playerArr, this.cpArr);

			if (error === null) {

				if (this.playerArr.length === round) {
					if (this.playerArr.length === 20) {
						display.rotate();
						display.win();
						round = 0;
						game.turn = "computer";
						setTimeout(function() {
							game.computer();
						}, 2000);
					} else {
						game.turn = "computer";
						setTimeout(function() {
							game.computer();
						}, 2000);
					}
				}
			}
		}
	},

	check: function(arr1, arr2) { // checks if playerArr matches cpArr

		for (var i = 0; i < arr1.length; i++) {
			if (arr1[i] !== arr2[i]) {
				display.incorrect();
				error = true;
				game.turn = "computer";
				this.playerArr = [];
				if (strictEnabled === "on") { // check for strict mode.
					round = 0;
					clrArr = [];
					setTimeout(function() {
						game.startGame();
					}, 2000);
				} else {
					setTimeout(function() {
						game.iterate();
					}, 2000);
				}
			}
		}

	},

	reduction: function() {
		if (round < 9) {
			return 300;
		}
		if (round < 15) {
			return 700;
		} else {
			return 900;
		}

	},

	iterate: function() { // flashes each color from cpArray

		setTimeout(function() {
			game.setPlayerTurn()
		}, 1000 * this.cpArr.length - this.reduction);
		for (var i = 0; i < this.cpArr.length; i++) {
			setTimeout(function(x) {
				return function() {
					if (game.cpArr[x] === "green") {
						display.flash('green');
					}
					if (game.cpArr[x] === "red") {
						display.flash('red');
					}
					if (game.cpArr[x] === "yellow") {
						display.flash('yellow');
					}
					if (game.cpArr[x] === "blue") {
						display.flash('blue');
					}
				}
			}(i), game.speed() * i);
		}
		error = null;

	},
	speed: function() {
		if (round < 9) {
			return 700;
		}
		if (round < 15) {
			return 500;
		} else {
			return 350;
		}
	},

	createArr: function() {
		for (var i = 0; i < 20; i++) {
			clrArr.push(colors[Math.floor(Math.random() * colors.length)])
		}
	}

}
              
            
!
999px

Console