JS1k: The JavaScript code golfing competition

for(_='0,,w/2,c.fillStyle="#0f=function=(d){=Math.5,Rect(",w-f,1>k?),-2);#FFF";w-e+m*w50	*h()|0)+2*(59)d.keyCode&&(===00Text(,3
var b=u=1	,e=w=5,-4,g=hrandom,k,l,m,n; p(d,r){"HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnUutFlUupLvUusUuo".split(/(?=[A-Z])/)[d],w-f+25
*r/2+u/2)} B(){c.font="24px "+(c.textAlign="center"if(f)#0","Game over"uelse{FF";w
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-]/.exec(_);)with(_.split(G))_=join(shift());eval(_)

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// JS1K ENTRY
// Title: Match Atomic Number
// by Muhammad Rifqi Priyo Susanto

// Initialize variables:
var h=300,		// height (h) of the canvas;
	p=u=h/2,	// player position (p) and half height (u) of the canvas;
	t=w=500,	// position of the clouds (t) and width (w) of the canvas;
	o=-4,		// position of the bricks and also status of the game (o);
	s=0,		// score (s);
	e = Math.random, // Math.random shortcut (e);
	r,	// random number and right answer (r);
	j,	// list of atomic number (j);
	i,	// for iteration (i).
	n;	// onkeydown function

// Draw the name of the element at specific position.
function l(z,y){
	c.fillText(
		// List of elements, split by using capital letter.
		"HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRnFrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnUutFlUupLvUusUuo".split(/(?=[A-Z])/)[z]
	,w-o+25,y*h/2+u/2);
}
function d(){
	// Change behavior.
	c.font="24px "+
	(c.textAlign="center");
	// If game over.
	if(-2===o){
		// Show score.
		c.fillStyle="#000";
		c.fillText("Game over",w/2,u);
		return;
	}else{
		// Set the background.
		c.fillStyle="#0FF";
		c.fillRect(0,0,w,h);
		
		// Draws clouds.
		c.fillStyle="#FFF";
		for(i=1;i<5;i++)
			c.fillRect(w-t+i*w,i*h/5,75,25),
			c.fillRect(w-t+i*w+20,i*h/5-5,35,35);
			//c.beginPath(),
			//c.arc(w-t+i*w,i*h/5,25,0,7),
			//c.arc(w-t+i*w+35,i*h/5,35,0,7),
			//c.arc(w-t+i*w+70,i*h/5,25,0,7),
			//c.fill();
		
		// Check clouds' position.
		if((t+=5)>h*9)t=w;
		
		// If not in any game status.
		if(o>-2){
			// Change elements for each brick.
			if(o<1)
				r=e()*2|0,
				j=[(r<1?1:0)+(e()*59|0)*2,(r<1?0:1)+(e()*59|0)*2],
				r=e()*2|0;
			
			// Check bricks' position and game status.
			o=o>600?0:o+1;
		
			// Draws bricks.
			c.fillStyle="#0F7";
			c.fillRect(w-o,0,50,h);
			c.fillStyle="#07F";
			c.fillRect(w-o,o>400?u+(o-400)*[1,-1][r]:u,50,h);
			
			// Name of the element.
			c.fillStyle="#000";
			l(j[0],0);
			l(j[1],1);
			
			// If player touches the brick:
			400===o && (
				// If right answer is top brick:
				r<1 ?
					// If player only touch top brick (no collision):
					p<=u-50 ?
						s++		// add score
					// else
					:
						o=-2	// indicate game over.
				// If right answer is top brick:
				:
					// If player only touch bottom brick (no collision):
					p<=u ?
						o=-2	// indicate game over
					// else
					:
						s++		// add score.
			);
			
			// Show score.
			c.fillText(s,w/2,25);
		}
		
		// Draws player into a block with atomic number inside it.
		c.fillStyle="red";
		c.fillRect(50,p,50,50);
		c.fillStyle="#FFF";
		c.fillText(o<-2?"Z":(j[r]+1),75,p+32);
	}
	
	// Wait 16 ms to redraw. (~60 FPS)
	setTimeout(d,16);
}

// Run the game.
d();

// Add handler when key down.
window.onkeydown=n=function(q){q=q.keyCode;
	// If UP/DOWN key is down and game hasn't started then start the game.
	if((q===38||q===40)&&-2>o)o=0;
	// If UP key is down then go up, if DOWN key then go down, else do nothing.
	if(q===38)p=Math.max(p-25,0);else if(q===40)p=p<h-50?p+25:p;
};

// Add handler when clicked.
a.onclick=function(q){
	// If top half canvas clicked then go up, if bottom half canvas then go down.
	q.keyCode=q.clientY<u?38:40;n(q);
};