Crayon Physics Deluxe is a game that I've been reading about for quite some time now. I've heard nothing but praise, but to be honest, it never really appealed to me, and I hadn't so much as downloaded the demo before today. So when I saw that they were offering the game on a "pay what you like" basis, I gave in to temptation.
I'm pretty glad that I did, too. For although Crayon Physics is basically a puzzle game (and I generally hate puzzle games), it's very enjoyable.
The basic premise is very simple. You have a ball on a landscape, and there's a star somewhere else on the landscape. You have to roll the ball across the landscape to collect the star.
How the heck am I going to get to that star, using only a crayon?
It's obviously not as easy as it sounds, though. There are gaps and obstacles in the way, and you have to figure out how to bridge these problems using only a crayon and your drawing skills. Unfortunately, I draw like a seven-year-old child. Fortunately, as you're using a crayon, that's almost an advantage.
There's not much more I can say about it, other than go and try it for yourself. The game encourages you to experiment and figure out solutions for yourself, and there can be several ways of getting to your goal, so each player should have a unique experience. As I said, it's being offered on a "pay what you like" basis until January 15th, so check it out.