Download or read book Puzzles for Brain Development: Yonmasu Puzzle - The Best Japanese Puzzles Collection written by Jeff Heldt and published by Logic Puzzle Games. This book was released on 2018-08-27 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Yonmasu ("Yonmasubunkatsu") is a logic puzzle invented by Naoki Inaba (Japan). A rectangular or square grid contains circles in some cells. The goal is to divide the grid into regions of exactly four cells. Each region contains one circle. logic puzzles for adults - logic puzzle books for adults - logic puzzle book - logic puzzle games - logic puzzle for adults - logic puzzle activity book - logic puzzle adult - logic puzzle grid - logic puzzle magazine - logic puzzle magazine for adults - logic puzzle workbook - logic puzzles for middle school - logic puzzle answers - logic puzzle books for middle school - logic puzzle brain teaser - logic puzzle beginner - logic puzzle daily - logic puzzle for middle school