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Positive brain intellectual game. Suitable for adults and children. 6 puzzles per page. 1002 killer sudoku puzzles extreme levels. Thick paper. Glossy cover. I hope you enjoy these puzzles. Killer sudoku may be called or searched with the following phrases or names: how to solve killer sudoku, how to play killer sudoku, sudoku sudoku sudoku, how to do killer sudoku, sudoku game expert, krazydad killer, sodoku knacker, multi sudoku puzzles, extreme 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, how to killer sudoku, krazydad killer sudoku super tough, soduko solve, sudoku cheat, observer sudoku killer, tips for killer sudoku, very easy sudoku, grille sudoku killer, arrow sudoku puzzle, sums sudoku, sums number place, samunamupure, kikagaku nampure, sumdoku. Best regards, Basford Holmes