Sudoku Ripple Effect - 200 Hard to Master Puzzles 7x7 (Volume 4)

By Dart Veider

Ripple Effect (also known as "Hakyuu", "Hakyuu Kouka", "Hakyukoka", "Seismic") is a logic puzzle published by Nikoli. The puzzle consists of a rectangular grid of any size divided into polyomino sections called "rooms". Each room must be filled with each of the numbers from 1 to the number of cells in the room. If two identical numbers appear in the same row or column, at least that many cells with other numbers must separate them.

• Format: Paperback
• Language: English
• ISBN: 1544027389
• ISBN13: 9781544027388
• Release Date: March 2017
• Publisher: Createspace Independent Publishing Platform
• Length: 138 Pages
• Weight: 0.43 lbs.
• Dimensions: 0.3" x 6.0" x 9.0"