Block Puzzle is, as one might expect, a puzzle game in which the player must slide a large red block through the exit by sliding it and other blocks of various colors and sizes around the playfield. There are 10 levels, each with a different combination of block sizes. A gameplay timer effects the score, and as incentive to get times as low as possible, the game is tied to an online, web-based hi-score page allowing players around the world to see how they rank. A nice touch.
It sounds like a rather basic game--and it is, but somehow it seems to just "get it right." If you've got a jailbroken iPhone, you won't want to miss it.
Block Puzzle and Soneso's other iPhone games and apps can be acquired through their Installer.app repository: http://www.soneso.com/iphone.