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Positive brain awesome game. Suitable for adults. 6 puzzles per page. 1002 killer sudoku puzzles hard levels. Thick paper. Glossy cover. Killer sudoku may be called or searched with the following phrases or names: dailykillersudoku, 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 hard, krazydad killer, sodoku knacker, multi sudoku puzzles, hard 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. I hope you enjoy these puzzles. Best regards, Basford Holmes