Shikaku Number Puzzle Book: 300 6x6 7x7 8x8 Large Easy To Hard Shikaku Japanese Logic Activity Puzzle Games For Teens And Adults, Travel Friendly 6'x9' 101 Pages 6 Puzzles Per Page - Shikaku (also known as Sikaku) is played on a square or rectangular grid Some of the squares in the grid are numbered The objective is to divide the grid into rectangular and square pieces such that each piece contains exactly one number, and that number represents the area of the rectangle Each puzzle has a unique solution which can be found without guessing Travel size book 6 x 9 fits in purse or backpack 300 brain teasersgrid difficulty level: 6x6, 7x7, 8x8each puzzle has a unique solutionstimulates positive cognitive function HAPPY PUZZLING