Positive brain, cool game. Suitable for adults and children. 6 puzzles per page. 250 Sudoku puzzles 9x9 easy levels. 250 Sudoku puzzles 9x9 medium levels. 250 Sudoku puzzles 9x9 hard levels. 252 Sudoku puzzles 9x9 extreme levels. Thick paper. Glossy cover. Sudoku puzzles of easy, medium, hard and extreme levels have a lot of names: sudoku, sudoku puzzles, sudoku game, sudoku solver, sudoku extreme, sudoku easy, sudoku medium, sudoku hard, sudoku very hard, daily sudoku, play sudoku, game sudoku, extreme sudoku puzzles, hard sudoku puzzles, very hard sudoku puzzles, easy sudoku puzzles, medium sudoku puzzles, le puzzle, 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, sudoku solutions, answers to sudoku puzzles, sudoku u, daily sudoku very hard, daily sudoku extreme, daily sudoku hard, daily sudoku easy, daily sudoku medium, sudoku creator, sudoku 9x9, sudoku puzzles collection, mega sudoku, best sudoku puzzles, all puzzle games, puzzle bubble, ultimate sudoku, sudoku of the day, best for puzzles sudoku, english sudoku puzzles, sudoku expert, monster sudoku, sudoku plus, puzzle pirates, sudoku x, epuzzle, sudoku net, sudoku mania, games puzzle games, fiendish sudoku, sudoku junior, usa sudoku, sudoku au, puzzle g, the sudoku, sudoku uk, sudoku evil, sudoku kingdom, usa today sudoku, hard extreme sudoku puzzles, best sudoku, big sudoku, addicted, how to sudoku, the daily sudoku, sudoku billions, sudoku maker, sudoku c, how to solve sudoku puzzles, sudoku name, daily sudoku game, sudoku o, blank sudoku grid, sudoku on, sudoku today hard, sudoku today easy, sudoku today medium, sudoku today extreme, sudoku sudoku, puzzled, sudoku competition, puzzle software, math sudoku, simple sudoku game. I hope you enjoy these puzzles. Best regards, Basford Holmes