Nurikabe

Nurikabe is a purely logic based puzzle game with three basic rules. The zip file contains the game and also contains some documents to get you started. You can read up on the puzzle itself on wikipedia: Nurikabe (hiragana: ぬりかべ) is a binary determination puzzle named for Nurikabe, an invisible wall in Japanese folklore that blocks roads and delays foot travel. Nurikabe was apparently invented and named by the publisher Nikoli; other names (and attempts at localization) for the puzzle include Cell Structure and Islands in the Stream.