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Positive brain awesome game. Suitable for adults. 6 puzzles per page. 1002 killer sudoku puzzles 9x9 medium levels. 8.5" X 11" Book. (215.9 mm X 279.4 mm). Thick paper. Glossy cover. Killer sudoku may be called or searched with the following phrases or names: 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, medium killer sudoku, sum doku, simple sudoku puzzle, krazydad killer sudoku, sudoku puzzle game, sudukus, killer sudoku books, times killer sudoku, sumdoku, sudoku books, easy killer sudoku, times killer sudoku books, killer sudoku puzzles, puzzle, the times killer sudoku books, times ultimate killer sudoku books, sudoku 9x9, killer sudoku puzzle books, killer puzzle, sumoku sudoku. I hope you enjoy these puzzles. Best regards, Basford Holmes