Rules!Rules! is currently available at the App Store (iOS) for $1.99.
It is absolutely, insanely good.
The premise is simple, seemingly. There's a grid of numbers (and a picture with each number), and you must clear these grids using rules that are given to you by the game. As the game progresses, you must remember more and more rules.
How many games, though, have rules involving mustaches and whales?
It's totally entertaining and addictive. I have an audio recording of Eli 13.0 giving amusing play-by-play commentary (in the normal course of playing the game) that I'll put up next week. In the meantime, buy this.
You will not be sorry.