Area mazes, or  "menseki meiro" as they're called in Japan, are logic puzzles with simple rules but sometimes complex solutions. Originally developed in Japan for students to develop logical and geometric thinking skills, this collection by Japanese puzzle master Naoki Inaba and first published in English by The Experiment Publishing brings area mazes to everyone - especially lovers of sudoku and other brain games. The first ones are easy, but the area mazes get progressively more difficult. 

In the first review of the English edition, boing boing's Mark Frauenfelder calls them "fun" and "addictive." You can read the whole review here, and try some of the puzzles for yourself!