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Positive brain awesome game. Suitable for adults. 6 puzzles per page. 500 sudoku killer puzzles hard levels. 502 sudoku killer puzzles extreme levels. Thick paper. Glossy cover. Killer sudoku may be called or searched with the following phrases or names: sudoku puzzle game, sudukus, killer su, play soduko, killer sudoku tips, super sudoku puzzles, sudoku game rules, sudoku ki, hard sudoku puzzles, sudoku game books, greater than sudoku, mini killer sudoku, sum sudoku solver, the big book of killer su doku, play sudoku puzzles, sudoku for adults, 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, medium 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. I hope you enjoy these puzzles. Best regards, Basford Holmes