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For adults. 6 puzzles per page. 500 killer sudoku puzzles hard levels. 502 killer sudoku puzzles extreme levels. Thick paper. 8.5" X 11" Book. (215.9 mm X 279.4 mm). Glossy cover. Killer sudoku may be called or searched with the following phrases or names: sudoku game hard, krazydad killer, sodoku knacker, multi sudoku puzzles, extreme sudoku games, hard sudoku game, 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,