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HTML 

              
                <div class="content">
		<div class="lights-container">
			<ul class="lights">
				<li id="first" class="ok"><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li><span></span></li>
				<li id="last"><span></span></li>
			</ul>
		</div>
		<div class="levels">
			<span class="activeLevel">1</span><span>2</span><span>3</span><span>4</span><span>5</span><span>6</span><span>7</span><span>8</span><span>9</span><span>10</span><br>
			<input id="level" type="range" min="16" max="88" value="88" step="8">
		</div>
		<div class="buttons">
			<span id="loser">0</span>
			<button id="levelDown">-</button>
			<button id="startLights">Start</button>
			<button id="stopLights">Stop</button>
			<button id="levelUp">+</button>
			<span id="winner">0</span>
		</div>
		<div id="accuracy"></div>
	</div>
!

CSS 

              
                body {
	background: #111;
	font-family: Arial, Helvetica, sans-serif;
}
.content {
    overflow: hidden;
}

/*** LIGHTS ***/
.lights-container {
    transform: rotate(45deg);
	position: relative;
    z-index: 0;
}
.lights-container:before {
    content: "CATCH THE LIGHT";
    color: #fc0;
    transform: rotate(-45deg);
    position: absolute;
    top: 46%;
    left: 0%;
    font-size: 2em;
    width: 100%;
    text-align: center;
    text-shadow: 0 0 5px #fc0, 0 0 15px #fc0;
}
.lights-container.level1:before  { content: "LEVEL 1"; }
.lights-container.level2:before  { content: "LEVEL 2"; }
.lights-container.level3:before  { content: "LEVEL 3"; }
.lights-container.level4:before  { content: "LEVEL 4"; }
.lights-container.level5:before  { content: "LEVEL 5"; }
.lights-container.level6:before  { content: "LEVEL 6"; }
.lights-container.level7:before  { content: "LEVEL 7"; }
.lights-container.level8:before  { content: "LEVEL 8"; }
.lights-container.level9:before  { content: "LEVEL 9"; }
.lights-container.level10:before { content: "LEVEL 10"; }

ul.lights {
    width: 50vw;
    height: 50vw;
    max-width: 425px;
    max-height: 425px;
    margin: 6vh auto 8vh;
    position: relative;
    padding: 0;
    border-radius: 100%;
}
ul.lights li {
    width: 80%;
    height: 80%;
    position: absolute;
    list-style: none;
    margin: 0;
    padding: 0;
    border-radius: 100%;
    margin: 10%;
}
ul.lights li:nth-child(2)  { transform: rotate(11.25deg);  }
ul.lights li:nth-child(3)  { transform: rotate(22.5deg);   }
ul.lights li:nth-child(4)  { transform: rotate(33.75deg);  }
ul.lights li:nth-child(5)  { transform: rotate(45deg);     }
ul.lights li:nth-child(6)  { transform: rotate(56.25deg);  }
ul.lights li:nth-child(7)  { transform: rotate(67.5deg);   }
ul.lights li:nth-child(8)  { transform: rotate(78.75deg);  }
ul.lights li:nth-child(9)  { transform: rotate(90deg);     }
ul.lights li:nth-child(10) { transform: rotate(101.25deg); }
ul.lights li:nth-child(11) { transform: rotate(112.5deg);  }
ul.lights li:nth-child(12) { transform: rotate(123.75deg); }
ul.lights li:nth-child(13) { transform: rotate(135deg);    }
ul.lights li:nth-child(14) { transform: rotate(146.25deg); }
ul.lights li:nth-child(15) { transform: rotate(157.5deg);  }
ul.lights li:nth-child(16) { transform: rotate(168.75deg); }
ul.lights li:nth-child(17) { transform: rotate(180deg);    }
ul.lights li:nth-child(18) { transform: rotate(191.25deg); }
ul.lights li:nth-child(19) { transform: rotate(202.5deg);  }
ul.lights li:nth-child(20) { transform: rotate(213.75deg); }
ul.lights li:nth-child(21) { transform: rotate(225deg);    }
ul.lights li:nth-child(22) { transform: rotate(236.25deg); }
ul.lights li:nth-child(23) { transform: rotate(247.5deg);  }
ul.lights li:nth-child(24) { transform: rotate(258.75deg); }
ul.lights li:nth-child(25) { transform: rotate(270deg);    }
ul.lights li:nth-child(26) { transform: rotate(281.25deg); }
ul.lights li:nth-child(27) { transform: rotate(292.5deg);  }
ul.lights li:nth-child(28) { transform: rotate(303.75deg); }
ul.lights li:nth-child(29) { transform: rotate(315deg);    }
ul.lights li:nth-child(30) { transform: rotate(326.25deg); }
ul.lights li:nth-child(31) { transform: rotate(337.5deg);  }
ul.lights li:nth-child(32) { transform: rotate(348.75deg); }

ul.lights li span {
    background: #fff;
    width: 2vw;
    height: 2vw;
    max-width: 20px;
    max-height: 20px;
    float: left;
    border-radius: 100%;
    box-shadow: 0px 0px 5px 1px #333 inset, 0px 0px 5px 10px #111111;
    border: 2px solid rgba(0,0,0,0.25);
	position: relative;
}
ul.lights li.ok span, ul.lights.winner {
	background: #36dc33;
    box-shadow: 0 0 5px 5px #36dc33, 0 0 15px 5px #36dc33, 0px 0px 6px 3px #ffffff2b inset, 0px 0px 5px 10px #111111;
}
ul.lights li.error span, ul.lights.loser {
	background: #ff2515;
    box-shadow: 0 0 5px 5px #ff2515;
}
ul.lights li#first span {
	background: #ffcc00;
    box-shadow: 0 0 5px 3px #ffcc00, 0 0 15px 5px #ffcc00, 0px 0px 5px 1px #333 inset, 0px 0px 5px 10px #111111;
    z-index: 2;
}
ul.lights li#first.ok span {
	background: #36dc33;
    box-shadow: 0 0 5px 3px #36dc33, 0 0 15px 5px #36dc33, 0px 0px 5px 1px #333 inset, 0px 0px 5px 10px #111111;
    z-index: 3;
}
ul.lights.loser li.ok span {
    background: #ff2515;
    box-shadow: 0 0 5px 3px #ff2515, 0 0 15px 5px #ff2515, 0px 0px 5px 1px #333 inset, 0px 0px 5px 10px #111111;
}
ul.lights:before {
    content: "";
    position: absolute;
    top: 46%;
    width: 100%;
    text-align: center;
    transform: rotate(-45deg);
    font-size: 2.25em;
    left: 0;
    margin-left: 0;
	text-shadow: 0 0 3px #111;
}
ul.lights.winner:before { content: "WINNER"; }
ul.lights.loser:before  { content: "LOSER"; }


/*** BUTTONS ***/
.buttons {
    text-align: center;
	z-index: 1;
    position: relative;
}
.buttons button {
    background: #FFCC00;
    border: none;
    font-size: 2em;
    padding: 0.5em 1em;
    border-radius: 5px;
    cursor: pointer;
    outline: none;
    text-align: center;
	text-shadow: 0 0 1px #111;
}
.buttons button:hover { background: #36dc33; }

#stopLights {
	display: none;
	padding: 0.5em 1.025em;
}

#stopLights:hover { background: #ff2515; }

.buttons span {
    font-size: 2em;
    padding: 0.5em 0.25em 0.05em;
    border-radius: 5px;
    width: 1.5em;
    line-height: 1.65em;
    position: relative;
    display: inline-table;
    top: 0.25em;
}
.buttons span:before {
	font-size: 0.35em;
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    line-height: 1em;
    background: rgba(0,0,0,0.25);
    padding: 0.35em 0;
	text-shadow: 0 0 1px #111111;
}

.buttons #loser:before  { content: "LOSER";  }
.buttons #winner:before { content: "WINNER"; }

#loser  { background: #ff2515;  }
#winner { background: #36dc33; }


/*** LEVELS ***/
.levels {
    left: calc(50% - 8.5em);
    text-align: center;
    margin-top: 0;
    margin-bottom: 1.5em;
	z-index: 1;
}
.levels span {
    color: #777777;
    display: inline-block;
    width: 1.65em;
}
#level {
    width: 20em;
	border-left: 5px solid #777777;
    border-right: 5px solid #777777;
	box-sizing: border-box;
	transform: rotate(180deg);
	cursor: pointer;
	height: 5px;
    background: #111111;
}
#levelDown, #levelUp {
    padding: 0.5em;
    width: 2em;
    background: #777777;
}
#levelDown:hover, #levelUp:hover {
    background: #FFC107;
}
.levels .activeLevel {
    color: #fc0;
}
#level:disabled, button#levelUp:disabled, button#levelDown:disabled, .levels.disabled > span {
    cursor: not-allowed;
    opacity: 0.25;
}


/*** RANGE STYLES ***/
input[type='range']:focus { outline: none; }
input[type='range'],
input[type='range']::-webkit-slider-runnable-track,
input[type='range']::-webkit-slider-thumb {
  -webkit-appearance: none;
}
input[type=range]::-webkit-slider-thumb {
  background-color: #FC0;
  width: 20px;
  height: 20px;
  border: 3px solid #111;
  border-radius: 50%;
  margin-top: -9px;
}
input[type=range]::-moz-range-thumb {
  background-color: #FC0;
  width: 15px;
  height: 15px;
  border: 3px solid #111;
  border-radius: 50%;
}
input[type=range]::-ms-thumb {
  background-color: #FC0;
  width: 20px;
  height: 20px;
  border: 3px solid #111;
  border-radius: 50%;
}
input[type=range]::-webkit-slider-runnable-track {
  background-color: #777;
  height: 3px;
}
input[type=range]:focus::-webkit-slider-runnable-track {
  outline: none;
}
input[type=range]::-moz-range-track {
  background-color: #777;
  height: 3px;
}
input[type=range]::-ms-track {
  background-color: #777;
  height: 3px;
}
input[type=range]::-ms-fill-lower {
  background-color: blue
}
input[type=range]::-ms-fill-upper {
  background-color: yellow;
} 


/*** LANDSCAPE VIEW ***/
.landscape .lights-container {
    float: left;
}
.landscape ul.lights {
    margin: 4vw;
    height: 80vh;
    width: 80vh;
}
.landscape .levels {
    float: right;
    margin-top: 6em;
    margin-right: 1.9em;
}
.landscape #loser, .landscape #winner {
	display: none;
}


/*** ACCURACY ***/
#accuracy {
    position: fixed;
    width: 100%;
    height: 2em;
    font-size: 2em;
    top: 10.5em;
    text-align: center;
    color: #111;
    display: none;
    text-shadow: 0 0 2px #111;
}
#accuracy:after {
    content: "ACCURACY";
    position: absolute;
    bottom: 0;
    font-size: 0.51em;
    margin-left: -45px;
    left: 50%;
}


/*** MEDIA QUERIES ***/
@media (max-width:480px){
	#loser, #winner {
		display: none;
	}
	ul.lights {
		width: 70vw;
		height: 70vw;
	}
}

/*** MOZILLA STYLES ***/
@-moz-document url-prefix() { 
	.buttons span {
		top: 0.175em;
	}
}
!

JS 

              
                level = '88';
winner = loser = 0;

function elem(id){
  var e = document.getElementById(id);
  return e;
}

function activateLevelNum(inputValue){
	var spanNum;
	switch(inputValue){
		case "88": spanNum = 0; break;
		case "80": spanNum = 1; break;
		case "72": spanNum = 2; break;
		case "64": spanNum = 3; break;
		case "56": spanNum = 4; break;
		case "48": spanNum = 5; break;
		case "40": spanNum = 6; break;
		case "32": spanNum = 7; break;
		case "24": spanNum = 8; break;
		case "16": spanNum = 9; break;
		default  : spanNum = 0;
	}
	var spans = document.querySelectorAll('.levels span');
	for(var i = 0; i<spans.length; i++){spans[i].classList.remove('activeLevel');}
	spans[spanNum].classList.add('activeLevel');
	document.querySelector('.lights-container').className = 'lights-container';
	document.querySelector('.lights-container').classList.add('level'+ parseInt(spanNum+1));
}

function addDisable(){
	elem('level').setAttribute('disabled','disabled');
	elem('levelUp').setAttribute('disabled','disabled');
	elem('levelDown').setAttribute('disabled','disabled');
	document.querySelector('.levels').classList.add('disabled');
}

function removeDisable(){
	elem('level').removeAttribute('disabled');
	elem('levelUp').removeAttribute('disabled');
	elem('levelDown').removeAttribute('disabled');
	document.querySelector('.levels').classList.remove('disabled');
}


var btnStart = elem('startLights');
btnStart.addEventListener('click', function() {
	document.querySelector('.lights').classList.remove('loser','winner');
	addDisable();
	this.style.display='none';
	this.nextElementSibling.style.display='inline-block';
	elem('accuracy').style.display = 'none';
	
	if(level=='88')document.querySelector('.lights-container').classList.add('level1');
	
	timer = setInterval(function(){	
		var x = document.querySelector('li.ok');
		if(x.id=='last'){
			elem('first').classList.add('ok');
			x.classList.remove('ok');
		} else {
			x.nextElementSibling.classList.add('ok');
			x.classList.remove('ok');
		}
	}, level);
});

var btnStop = elem('stopLights');
btnStop.addEventListener('click', function() {
	document.querySelector('.lights').classList.remove('loser','winner');	
	removeDisable();
	this.style.display='none';
	this.previousElementSibling.style.display='inline-block';
	clearInterval(timer);	
	if(elem('first').classList == 'ok') {
		document.querySelector('.lights').classList.add('winner');
		winner++;
		elem('winner').innerHTML=winner;
		
		if(level == '16'){
			var total = parseInt(winner + loser);
			var percent = winner / total * 100;
			elem('accuracy').innerHTML = percent.toFixed() +'%';
			elem('accuracy').style.display = 'block';
		}
		
		levelSelector.stepDown(1);
		level = levelSelector.value;
		activateLevelNum(level);
		
	} else {
		document.querySelector('.lights').classList.add('loser');			
		loser++;
		elem('loser').innerHTML=loser;
	}
});

var levelSelector = elem('level');
levelSelector.addEventListener('change', function() {
	level = this.value;
	activateLevelNum(level);
});

var levelUpBtn = elem('levelUp');
levelUpBtn.addEventListener('click', function() {
	document.querySelector('.lights').classList.remove('loser','winner');
	levelSelector.stepDown(1);
	level = levelSelector.value;
	activateLevelNum(level);
});

var levelDownBtn = elem('levelDown');
levelDownBtn.addEventListener('click', function() {
	document.querySelector('.lights').classList.remove('loser','winner');
	levelSelector.stepUp(1);
	level = levelSelector.value;
	activateLevelNum(level);
});
!
999px

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