Download or read book Mini Brain Puzzles: Triplets Puzzles - The Best Stress Relief Puzzles written by Rebecca Howell and published by Mental Puzzles for Adults. This book was released on 2018-09-11 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Triplets ("One or All") is a logic puzzle invented by Naoki Inaba (Japan). The task consists of a rectangular or square grid divided into regions of exactly three cells. Some cells contain figures of 3 kinds: squares, circles, triangles. The goal is to fill in each cell with figures. Each region must contain all identical or all different figures. When two figures are orthogonally adjacent across a region boundary, the figures must be different. mental puzzles for adults - mental puzzles for seniors - mental puzzles books - maths puzzles with answers - brain puzzle games - number puzzles - brain puzzles for adults - math puzzles for adults - brain games for adults - brain teasers riddles - mind puzzle games - mind puzzles for adults - mind puzzle