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Positive style. Suitable for adults. 6 puzzles per page. 500 killer sudoku puzzles medium levels. 502 killer sudoku puzzles hard levels. Thick paper. Glossy cover. Killer sudoku may be called or searched with the following phrases or names: greater than killer sudoku, sudoku grid, times sudoku, sudoku medium, sudoku hard, difficult sudoku, sudoku of the day, sudoku hints, sum sudoku puzzles, sudoku hard, jigsaw sudoku puzzles, la times sudoku, sudoku x, puzzle killer, krazydad sudoku, sudoku net, sudoku medium, killer sudoku solver, sudoku mania, fiendish sudoku, daily killer sudoku main past puzzles, times puzzles killer, sudoku uk, dkm sudoku, usa today sudoku, play sudoku game, the daily sudoku, sudoku billions, sudoku x wing, lovatts sudoku, sudoku k, sudoku name, how to solve sumoku puzzles, guardian sudoku, guardian killer sudoku, telegraph killer sudoku, sudoku cage, sudoku sudoku, times ultimate killer sudoku, killer sudoku solutions, telegraph sudoku, daily sudoku puzzle, the sudoku killer, zero killer sudoku, sudoku quest, hard killer sudoku, medium killer sudoku, sum doku, simple sudoku puzzle, krazydad killer sudoku, sudoku puzzle game, sudukus, killer su, play soduko, killer sudoku tips, super sudoku puzzles, sudoku game rules, sudoku ki, medium sudoku puzzles, 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 children, 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 medium, sudoku game hard, krazydad killer, sodoku knacker, multi sudoku puzzles, mega sudoku puzzles, sudoku puzzle maker. I hope you enjoy these puzzles. Best regards, Basford Holmes