Nurikabe C64

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 (puzzle) - Wikipedia

Written for the Reset64 Craptastic competition the whole game comes in at exactly 4096 bytes when compressed. That gets you 50 puzzles and music by the always excellent Saul Cross.