Not wasting enough time yet today? I have just the thing for you. Bloxorz is a dangerously addictive game that will exercise your spatial reasoning muscles. Not to mention your procrastination muscles. I have no idea how to pronounce Bloxorz, but then again, I don’t speak hax0r.
The idea is to roll a little brick past various obstacles while preventing it from plummeting, Q*bert style, into empty space. It’s very nicely made. Love the little metal-brick clinky sounds. And I like the fact that there’s absolutely no time pressure.
Let me know how far you get. I haven’t gotten past stage 15 yet.
(This is another quality link that I picked up from collision detection.)