Giant Activity Book Relax and enjoy solving these easy to super hard puzzles to stay sharp and have fun! Sudoku puzzles add a fresh challenge to your mental workout. Although they are number puzzles, they do not require math skills. The objective of these crosswords without words is to place the numbers 1 through 9 only once in each horizontal row of squares, each vertical column of squares, The puzzles have some numbers filled in, and you work out the rest. You never have to guess; all the puzzles can be solved by logic. Features: - 500 sudoku puzzles - Big grids for easy solving - 8.5 x 11 inches All the answers are included in the back. Please, don't cheat! Perfect as a gift!.