Tons of Hakyuu for Adults & Seniors: 1000 Easy to Hard Puzzles (10x10)

Hakyuu (also known as "Hakyukoka", "Ripple Effect", "Hakyuu Kouka" and "Seismic") is a logic puzzle with simple rules and challenging solutions.  It is played on a rectangular grid of any size divided into polyomino sections called rooms.

This Logic Puzzles book is packed with the following features:

- 1000 Hakyuu (10x10) Puzzles for everyone in 3 Difficulty Levels: 333 Easy, 334 Medium, 333 Hard.

- Answers to every puzzle are provided.

- Each puzzle is guaranteed to have only one solution.

- Six puzzles per page (8.5 x 11 inches).

- Includes free bonus puzzles you can download book (Fitness for your brain: Word Search With Hidden Message: Train your brain anywhere, anytime! - 102 Puzzles for Adults and Seniors).