diff --git a/experiment/addition_game.html b/experiment/addition_game.html
new file mode 100644
index 0000000..a421f34
--- /dev/null
+++ b/experiment/addition_game.html
@@ -0,0 +1,246 @@
+<html>
+	<head>
+		<title>Addition Game</title>
+		<style>
+*, td {
+	font-family: monospace;
+	font-size: 12px;
+	text-align: center;
+}
+
+#game {
+	width: 640px;
+	height: 480px;
+}
+
+#game tbody tr td {
+	width: 160px;
+	height: 160px;
+}
+
+.p1 {
+	border: none;
+	background: #33b5e5;
+}
+
+.p1:hover {
+	background: #0099cc;
+}
+
+.p2 {
+	border: none;
+	background: #99cc00;
+	-webkit-transform: rotate(180deg);
+	-moz-transform: rotate(180deg);
+	-o-transform: rotate(180deg);
+	transform: rotate(180deg);
+}
+
+.p2:hover {
+	background: #669900;
+}
+
+.number {
+	font-size: 150px;
+	border-radius: 150px;
+	width: 150px;
+	height: 150px;
+	text-align: center;
+	vertical-align: middle;
+}
+
+.control button, .adder button {
+	height: 30px;
+	width: 75%;
+	font-size: 25px;
+}
+
+.stat {
+	padding-top: 5px;
+	height: 70px;
+	font-size: 15px;
+	width: 75%;
+}
+		</style>
+	</head>
+	<body>
+		<div style="font-size: 10px;">
+			Addition Game<br/>
+			Fun and makes you smarter!
+		</div>
+		<table id="game">
+			<tbody>
+				<tr>
+					<td><div id="p2_right" class="p2 number"></div></td>
+					<td><div id="p2_control" class="control"></td>
+					<td><div id="p2_left" class="p2 number"></div></td>
+				</tr>
+				<tr>
+					<td>
+						<div id="p2_add1" class="adder"></div>
+						<div id="p1_add2" class="adder"></div>
+					</td>
+					<td>
+						<div id="status1" class="p2 stat"></div>
+						<div id="status2" class="p1 stat"></div>
+					</td>
+					<td>
+						<div id="p2_add2" class="adder"></div>
+						<div id="p1_add1" class="adder"></div>
+					</td>
+				</tr>
+				<tr>
+					<td><div id="p1_left" class="p1 number"></div></td>
+					<td><div id="p1_control" class="control"></div></td>
+					<td><div id="p1_right" class="p1 number"></div></td>
+				</tr>
+			</tbody>
+		</table>
+		<script src="about:blank"></script>
+		<script>
+var $ = function(id){
+	return document.getElementById(id);
+};
+
+var p1 = [1,1];
+var p2 = [1,1];
+var turn = 0; //p1's turn
+var d = {
+	p1: {
+		c: $("p1_control"),
+		r: $("p1_right"),
+		l: $("p1_left"),
+		a1: $("p1_add1"),
+		a2: $("p1_add2"),
+		s: $("status1")
+	},
+	p2: {
+		c: $("p2_control"),
+		r: $("p2_right"),
+		l: $("p2_left"),
+		a1: $("p2_add1"),
+		a2: $("p2_add2"),
+		s: $("status2")
+	},
+};
+
+function log(text){
+	d.p1.s.innerHTML = d.p2.s.innerHTML = text;
+}
+
+function set(player,id,amount){
+	var lr = ["left","right"];
+	log(amount+" was added to player"+player+"'s "+lr[id]+" number");
+	window["p"+player][id] = (window["p"+player][id] + amount)%5;
+	turn = (turn+1) %2;
+	update();
+}
+
+function setb(player,a,b){
+	log("player"+player+" swap between two number ("+a+","+b+")");
+	var p = window["p"+player];
+	p[0] = a;
+	p[1] = b;
+	turn = (turn+1) %2;
+	update();
+}
+
+function get_control(player){
+	var p = window["p"+player];
+	var total = p[0]+p[1];
+	var pairs = [];
+	for(var i=0;i<5;i++){
+		if(
+			total-i<5&&
+			total-i>=0&&
+			p[0]!==i&&
+			p[1]!==total-i
+		) {
+			pairs.push([i,total-i]);
+		}
+	}
+	return pairs;
+}
+
+function checkwins(){ //check for any wins
+	if(p1[0] === p1[1] && p1[0] === 0){
+		return "player2";
+	} else if(p2[0] === p2[1] && p2[0] === 0){
+		return "player1";
+	}
+	return false;
+}
+
+window.onload = function(){
+	log("Ready, Set, Go!");
+	update();
+};
+
+function update(){
+	var winner = checkwins();
+	if(winner!==false){
+		log(winner+" wins!");
+	}
+	//player1
+	d.p1.l.innerHTML = p1[0];
+	d.p1.r.innerHTML = p1[1];
+	d.p1.a1.innerHTML = [
+		"<button class='p1' onclick='set(2,0,"+p1[0]+")' "+
+			(p1[0]===0||turn===1||winner!==false?"disabled":"")+
+		">add "+p1[0]+"</button>",
+		"<br/>",
+		"<button class='p1' onclick='set(2,0,"+p1[1]+")' "+
+			(p1[1]===0||turn===1||winner!==false?"disabled":"")+
+		">add "+p1[1]+"</button>"
+	].join("");
+	d.p1.a2.innerHTML = [
+		"<button class='p1' onclick='set(2,1,"+p1[0]+")' "+
+			(p1[0]===0||turn===1||winner!==false?"disabled":"")+
+		">add "+p1[0]+"</button>",
+		"<br/>",
+		"<button class='p1' onclick='set(2,1,"+p1[1]+")' "+
+			(p1[1]===0||turn===1||winner!==false?"disabled":"")+
+		">add "+p1[1]+"</button>"
+	].join("");
+	d.p1.c.innerHTML = "";
+	var c1 = get_control(1);
+	for(var i=0;i<c1.length;i++){
+		d.p1.c.innerHTML +=
+			"<button class='p1' onclick='setb(1,"+c1[i][0]+","+c1[i][1]+")'"+
+				(turn===1||winner!==false?"disabled":"")+
+			">"+c1[i].join("-")+"</button><br/>";
+	}
+	//player2
+	d.p2.l.innerHTML = p2[0];
+	d.p2.r.innerHTML = p2[1];
+	d.p2.a1.innerHTML = [
+		"<button class='p2' onclick='set(1,0,"+p2[0]+")' "+
+			(p2[0]===0||turn===0||winner!==false?"disabled":"")+
+		">add "+p2[0]+"</button>",
+		"<br/>",
+		"<button class='p2' onclick='set(1,0,"+p2[1]+")' "+
+			(p2[1]===0||turn===0||winner!==false?"disabled":"")+
+		">add "+p2[1]+"</button>"
+	].join("");
+	d.p2.a2.innerHTML = [
+		"<button class='p2' onclick='set(1,1,"+p2[0]+")' "+
+			(p2[0]===0||turn===0||winner!==false?"disabled":"")+
+		">add "+p2[0]+"</button>",
+		"<br/>",
+		"<button class='p2' onclick='set(1,1,"+p2[1]+")' "+
+			(p2[1]===0||turn===0||winner!==false?"disabled":"")+
+		">add "+p2[1]+"</button>"
+	].join("");
+	d.p2.c.innerHTML = "";
+	var c2 = get_control(2);
+	for(var i=0;i<c2.length;i++){
+		d.p2.c.innerHTML +=
+			"<button class='p2' onclick='setb(2,"+c2[i][0]+","+c2[i][1]+")'"+
+				(turn===0||winner!==false?"disabled":"")+
+			">"+c2[i].join("-")+"</button><br/>";
+	}
+}
+		</script>
+		<script src='../js/nav.js'></script>
+	</body>
+</html>
\ No newline at end of file
diff --git a/experiment/index.html b/experiment/index.html
index ab146fc..23b6f00 100644
--- a/experiment/index.html
+++ b/experiment/index.html
@@ -11,6 +11,7 @@
 			<li><a href='waterdrop.html' title='2014'>Waterdrop</a></li>
 			<li><a href='positive_lens.html' title='June 15, 2014'>Positive Lens</a></li>
 			<li><a href='negative_lens.html' title='June 20, 2014'>Negative Lens</a></li>
+			<li><a href='addition_game.html' title='September 29, 2014'>Addition Game</a></li>
 		</ul>
 		<script src='../js/nav.js'></script>
 	</body>
diff --git a/experiment/positive_lens.html b/experiment/positive_lens.html
index a2062f8..cac41ee 100644
--- a/experiment/positive_lens.html
+++ b/experiment/positive_lens.html
@@ -18,5 +18,5 @@
 	    <script>
 function G(a,b){for(a=a||1,b=b||1,0>a&&(a=-a),0>b&&(b=-b),b>a&&(a=[b,b=a][0]);;){if(a%=b,0==a)return b;if(b%=a,0==b)return a}}function L(a,b){return a/G(a,b)*b}function k(a,b,c,d){var e=L(b,d),f=e/b*a-e/d*c,g=G(e,f);return[f/g,e/g]}for($ in a)a[$[0]+$[$.length>>1]]=a[$];function l(a,b,c,d,e){var f=a*-d+b*c,a=c-a,b=d-b;return(b*e+f)/a}var e=1e3,g=500,i=500,j=250,h=50,s=240,f=120,K=k(1,f,1,s),S=K[1]/K[0],M=Math.abs(S,s),H=h*M;c.width=e;c.height=g;window.onkeydown=function(a){switch(a.keyCode){case 37:i-1>s&&s++;break;case 38:j-1>h&&h++;break;case 39:s>0&&s--;break;case 40:h>0&&h--}d()};function d(){with(K=k(1,f,1,s),S=K[1]/K[0],M=Math.abs(S/s),H=h*M,a)(A=function(x,y){le(x,y);so();bn();}),cr(0,0,e,g),strokeStyle="#00f",bn(),me(0,j),A(e,j),me(i,9),A(i,g),me(i-3,4),A(i+3,4),me(i,1),A(i,7),strokeStyle="#f00",me(i-s,j),A(i-s,j-h),f>s&&setLineDash([4]),me(i+S,j),A(i+S,j-H*(f>=s?1:-1)),f>s&&setLineDash([0]),strokeStyle="#2af",me(i-f,j-5),A(i-f,j+5),me(i+f,j-5),A(i+f,j+5),me(i-2*f,j-5),A(i-2*f,j+5),me(i+2*f,j-5),A(i+2*f,j+5),strokeStyle="#282",me(i-s,j-h),le(i,j-h),A(e,l(i,j-h,i+f,j,e)),(s<=f&&(setLineDash([4]),me(i,j-h),A(0,l(i,j-h,i+f,j,0)),setLineDash([0]))),me(i-s,j-h),A(e,l(i-s,j-h,i,j,e)),(s<=f&&(setLineDash([4]),me(i-s,j-h),A(0,l(i-s,j-h,i,j,0)),setLineDash([0])))}d();
 	    </script>
-	    <script src='../js/nav.js'></script>
+		<script src='../js/nav.js'></script>
 </body></html>
