Positive brain, cool game. Suitable for adults. 6 puzzles per page. 500 Sudoku puzzles 8x8 medium levels. 502 Sudoku puzzles 8x8 hard levels. Thick paper. Glossy cover. Sudoku puzzles of medium and hard levels have a lot of names: sudoku, sudoku puzzles, sudoku game, sudoku solver, sudoku medium, sudoku hard, daily sudoku, play sudoku, game sudoku, medium sudoku puzzles, hard sudoku puzzles, le puzzle, sudoku with answers, sudoku grid, sudoku for adults, sudoku site, play jigsaw puzzle, brain teasers, suduku for beginners, a sudoku puzzle, sudoku tricks, sudoku rules, puzzle bobble, daily puzzle, how to solve sudoku, logic puzzle games, su doku, puzzle en francais, daily jigsaw puzzle, 7sudoku, the puzzle, jigsaw sudoku, sudoku solution, the jigsaw puzzles, bubble puzzle, logic puzzles, sudoku for beginners, su do ko, sudoku so, sudoku 9, sudoku or sudoku, b sudoku, medium sudoko, hard sudoko, game play sudoku, a sudoku, sudoku b, sudoku en linea, do sudoku, sudoku ku, sudoku g, sudoku s 2, number of sudoku puzzles, sudokop, sudoku d, puzzle, sudoku for kids, block puzzle, sudoku for dummies, jigsaw puzzles for sale, custom puzzles, puzzles for adults, puzzle books. I hope you enjoy these puzzles. Best regards, Basford Holmes