Книга "SUDOKU Book Puzzle 500+ Easy to Very Hard". Training your brain is the greatest challenge of all times, and SUDOKU is one of the best puzzle games to do [link] you have 512 SUDOKU puzzles for adults, 9x9, on 4 levels with the Solutions printed at the end of the [link] IT GREAT!About: * 6x9 inches * 164 pages total