Positive brain game. Suitable for adults and children. 6 puzzles per page. 1002 killer sudoku puzzles extreme levels. 8.5" X 11" Book. (215.9mm X 279.4mm). Thick paper. Glossy cover. Killer sudoku may be called or searched with the following phrases or names: sumoku puzzle book, daily killer, how to solve killer sudoku, how to play killer sudoku, sudoku sudoku sudoku, how to do killer sudoku, sudoku game extreme, krazydad killer, sodoku knacker, multi sudoku puzzles, easy sudoku games, mega sudoku puzzles, sudoku puzzle maker, difficult sudoku puzzles, killer sudoku brainbashers, best sudoku game, best sudoku puzzles, killersud, killer sudoku cheat sheet, sample sudoku puzzles, sudoku summer, sudoku welt, suduko for beginners, who is the killer puzzle, killer sudoku pro, big sudoku puzzles, different sudoku puzzles, the guardian killer sudoku, sudoku loeser, killer sudoku rules, sudoku tool, beachcomber sudoku puzzles, take a break killer sudoku, krazydad sudoku killer, sodakku, sum sudoku tips, krazydad killer sudoku tough, killer sudoku uk, killer, gratis sudoku, open sudoku puzzles, sudoku number puzzle, brainbashers daily killer sudoku, sudoku game 9x9, sudoku or sudoku, largest sudoku puzzle, guardian killer sudoku today, killer sudoku techniques, killersudoku solver, sudoku games offline. I hope you enjoy these puzzles. Best regards, Basford Holmes