Suduko Book Easy To Hard Puzzles for Adults ,Seniors, and other Puzzle Fans Keep Your Brain Sharp & Entertained 90 puzzles with solutions. - 3 Difficulty levels Easy Medium Hard. - Play with 1,2,3,4,5,6,7,8,9 number. - 1 Puzzle page. - Small size easy to carry. - Dimensions 4" x 6" (10.16 x 15.24 cm.) - White paper (90GSM.) - Soft glossy paperback (220GSM.). - Professional printing and perfect binding. - High-Quality. - Fast Delivery. Activity Books For Adults , Suduko Books For Adults , Pocket Size Sudoku Books For Adults , Sudoku Books For Adults One Per Page ,Brain Teaser Book For Adults