>>> Detailed explanation of Heyawake in Wikipedia
Heyawake is one of the Nikoli original puzzle. "Heya" means "room", "wake" means "divide". So, Heyawake means "divide a room".

Nikoli Puzzle Guide [Heyawake] (Text Version)

| Akari | Fillomino | Hashiwokakero | Heyawake | Hitori | Kakuro | Kurodoko | LITS | Masyu | Nansuke | Numberlink | Nurikabe | Ripple Effect | Shikaku | Slitherlink | Sudoku | Suraromu | Tentai Show | Yajilin |