Leo en 
como en la web http://bytex64.net/code/datasnake/ se han hecho el juego de la Serpiente en un Javascript ejecutable como url:
data:text/html,<script>function P(x,y){return{x:x,y:y}}function J(){return Math.floor(Math.random()*16)}function R(){do{z={x:J(),y:J()}}while (T(z));return z}function A(a,b){return{x:a.x+b.x,y:a.y+b.y}}function Q(a,b){return a.x==b.x&&a.y==b.y}function O(p){return p.x<0||p.x>15||p.y<0||p.y>15}function T(p){return s.filter(Q.bind(this,p)).length}function M(p){if(p.x!=-d.x&&p.y!=-d.y)m=p}function B(){s.map(function(p){c.fillRect(p.x<<3,p.y<<3,8,8)})}function C(){c.beginPath();c.arc((a.x<<3)+4,(a.y<<3)+4,4,0,7);c.fill()}function F(){c.fillStyle=’red’;B();setTimeout(I,5000)}function E(){d=m;n=A(s[0],d);(O(n)||T(n))&&(F(),1)||setTimeout(E,350-s.length*5);s.unshift(n);Q(s[0],a)&&(a=R())||s.pop();c.clearRect(0,0,128,128);B();C()}window.addEventListener(‘keydown’,function(e){M({37:P(-1,0),38:P(0,-1),39:P(1,0),40:P(0,1)}[e.keyCode])},false);function I(){document.body.innerHTML='<canvas width=128 height=128 style="width:256px;height:256px;border:8px solid black"></canvas>’;c=document.body.firstChild.getContext(‘2d’);s=[P(8,8),P(7,8),P(6,8)];a=R();m=P(1,0);E()}setTimeout(I,0)</script>
En formato legible:
<!DOCTYPE html>
<script type="text/javascript">
function P(x,y) {
return {x: x, y: y};
}
function J() {
return Math.floor(Math.random() * 16);
}
function R() {
do {
z={x: J(), y: J()}
} while (T(z))
return z;
}
function A(a,b) {
return {x: a.x + b.x, y: a.y + b.y};
}
function Q(a,b) {
return a.x == b.x && a.y == b.y;
}
function O(p) {
return p.x < 0 || p.x > 15 || p.y < 0 || p.y > 15;
}
function T(p) {
return s.filter(Q.bind(this,p)).length;
}
function M(p) {
if (p.x != -d.x && p.y != -d.y)
m = p;
}
function B() {
s.map(function(p) {
c.fillRect(p.x << 3, p.y << 3, 8, 8);
});
}
function C() {
c.beginPath();
c.arc((a.x << 3) + 4, (a.y << 3) + 4, 4, 0, 7);
c.fill();
}
function F() {
c.fillStyle=’red’;
B();
setTimeout(I, 5000);
}
function E() {
d = m;
var n = A(s[0],d);
(O(n) || T(n)) && (F(),1) || setTimeout(E, 350 – s.length * 5);
s.unshift(n);
Q(s[0],a) && (a = R()) || s.pop();
c.clearRect(0,0,128,128);
B();
C();
}
window.addEventListener(‘keydown’, function(e) {
M({ 37: P(-1,0), 38: P(0,-1), 39: P(1,0), 40: P(0,1) }[e.keyCode]);
}, false);
function I() {
document.body.innerHTML = ‘<canvas width=128 height=128 style="width:256px;height:256px;border:8px solid black"></canvas>’;
c = document.body.firstChild.getContext(‘2d’);
s = [P(8,8),P(7,8),P(6,8)];
a = R();
m = P(1,0);
E();
}
setTimeout(I,0);
</script>
Un poco de Java 
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