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Positive brain awesome game. Suitable for adults. 6 puzzles per page. 1002 sudoku puzzles extreme levels. Thick paper. Glossy cover. 8.5" X 11" Book. (215.9 mm X 279.4 mm). Killer sudoku may be called or searched with the following phrases or names: play sudoku, sudoku solver, how to do sudoku, the times ultimate killer sudoku, play killer sudoku, sudoku answers, ultimate killer sudoku, how to play sudoku, sudoku rules, sudoku challenge, how to solve sudoku, sudoku puzzle solver, su doku, jigsaw sudoku, sudoku solution, 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, grille sudoku killer, arrow sudoku puzzle, sums sudoku, sums number place, samunamupure, kikagaku nampure, sumdoku. I hope you enjoy these puzzles. Best regards, Basford Holmes