Download or read book Hard Math Puzzles for Adults: Sujiken Puzzles - The Best Stress Relief Puzzles written by Rebecca Howell and published by Brain Games for Adults. This book was released on 2018-09 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sujiken (from Japanese "sujikai," literally "diagonal") is a variation of Sudoku, invented by George Heineman (USA). The puzzle consists of a triangular grid of cells containing digits from 1 to 9. The objective is to fill a grid with digits so that each cell contains a digit and no digit is repeated in any column, row and diagonal in any direction. Also, no digit occurs twice in any of the three larger 3 x 3 square regions and any of the three larger triangular regions enclosed by thick borders. puzzle games for adults - puzzle game for adults - puzzle game book - puzzle game adult - puzzle game brain teaser - puzzle game gift - jigsaw puzzle games - logic game book - logic game puzzles - logic games for adults - math games - math game adult - math game books - brain games - brain games for adults - brain game books - brain game puzzles - brain game adults - brain game books for seniors - brain game for adult - brain game large print