Nurikabe is a logic game. It might remind you of Minesweeper, but this is way cooler.

You can learn it quite fast (this and this are good tutorials for Nurikabe). Here you’ll find a freeware version of Nurikabe for Palm, and here are some online puzzles.

The theory of the game is discussed here (there are no puzzle generators and solvers for Nurikabe yet, so if you write one, pls, let us know).

[image source: Wikipedia]

LE: Ok, we’ve found a Nurikabe solver here.