JS1k: The JavaScript code golfing competition

x=9;y=336;z=10;K=[];L=[[20,290]];p=document.body.children[X=Y=J=T=V=0];p.width=W=224;p.height=H=352;q=p.getContext('2d');function R(x,y,w,h,c){q.fillStyle=c;q.fillRect(x,y,w,h)}function C(a,b){j=(b>336)?0:q.getImageData(a,b,1,1).data;if(j[0]==255&!j[1]&!j[2])return 1;return}function P(y){if(y>40){e=r(30,134);f=y-r(40,80);L.push([e,f])}}function r(a,b){return a+Math.round(Math.random()*(b-a))}setInterval(function(){if(!V){T++;s=(T>300)?1:0;if(s)y++;a=x+X;b=a+15;if(a<0)x=X=0;if(b>W){x=208;X=0}x+=X;y+=Y;O=0;if(Y>=0){m=5;while(m<14){c=y+15;if(C(a,c)||C(b,c)){g=C(a,c)?a:b;while(C(g,y+14))y--;O=1;m=14}m+=4}if(y>=336){if(!s){O=1;y=336}else V=1}}if(O)Y=J=0;else if(Y<11)Y++;R(0,0,W,H,'#9CF');R(x,y,16,16,'#000');P(L[L.length-1][1]);for(I in L){if(s)L[I][1]+=1;R(L[I][0],L[I][1],60,16,'red')}}},20);onkeydown=function(e){Z(e,1)};onkeyup=function(e){Z(e,0)};function Z(e,u){E=e.keyCode;if(!E-37>>2){if(E==38){if(!J&Y<=1){J=1;Y=-14}}else{j=K.indexOf(E);if(j>-1)K.splice(j,1);!u?E=K[K.length-1]:K.push(E);X=E^37?E^39?0:2:-2}}}

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

// Init Datas
	x = 9;
	y = 336;
	z = 10;
	K = [];
	L = [[20,290]];

	// Scene
		p = document.body.children[X=Y=J=T=V=0];
			p.width = W = 224;
			p.height = H = 352;
		q = p.getContext('2d');

// Functions
	// Draw rectangle
		function R(x,y,w,h,c){
			q.fillStyle = c;
			q.fillRect(x,y,w,h);
		}
	// Check pixel color at (a;b)
		function C(a,b){
			j = (b > 336) ? 0 : q.getImageData(a,b,1,1).data;
			if(j[0] == 255 & !j[1] & !j[2]) return 1;
			return;
		}
	// Generate new platform
		function P(y){
			if (y > 40) {
				e = r(30,134);
				f = y - r(40,80);
				L.push([e,f]);
			}
		}
	// Generate random number (interval = (a;b))
		function r(a,b){return a + Math.round(Math.random() * (b - a));}

// Game loop
	setInterval(
		function(){
		if (!V) {
			T++;
			s = (T > 300) ? 1 : 0;

			if (s) y++;

			a = x + X;
			b = a + 15;				

			// Horizontal limits
				if(a < 0) x=X=0;
				if(b > W){
					x=208;
					X=0;
				}

			// Update position
				x += X;
				y += Y;
			
			O = 0;
				
			if (Y >= 0) {
				m = 5;
				while (m < 14) {
					c = y + 15;
					if(C(a,c) || C(b,c)){
						g = C(a,c) ? a : b;
						while (C(g,y + 14)) y--;
						O = 1;
						m = 14;
					}
					m += 4;
				}
				if (y >= 336) {
					if (!s) {
						O = 1;
						y = 336;
					}
					else V=1;
				}
			}
			if (O) Y=J=0;
			else if (Y < 11) Y++;

			// Draw scene
				R(0,0,W,H,'#9CF');
				R(x,y,16,16,'#000');
				
				// Add new platform and draw platforms
					P(L[L.length-1][1]);
					for (I in L) {
						if (s) L[I][1] += 1;
						R(L[I][0],L[I][1],60,16,'red');
					}
		}
		},
		20
	);
// Keyboard events
	onkeydown = function(e){Z(e,1);};
	onkeyup = function(e){Z(e,0);};
	function Z(e,u){
		E = e.keyCode;
		if(!E-37 >> 2){						
			if(E == 38) {
				if (!J & Y <= 1) {
					J = 1;
					Y = -14;
				}
			}
			else {
				j = K.indexOf(E);
				if(j > -1) K.splice(j,1);
				!u ? E = K[K.length-1] : K.push(E);
				X = E^37 ? E^39 ? 0 : 2 : -2;
			}
		}
	}