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Positive style. Suitable for adults. 6 puzzles per page. 1002 extreme. Thick paper. Glossy cover. Killer sudoku may be called or searched with the following phrases or names: sudoku, sum sudoku, killer sudoku books, times killer sudoku, sumdoku, sudoku books, extreme killer sudoku, expert 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, times sudoku, sudoku very 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, killer sudoku solver, sudoku mania, fiendish sudoku, daily killer sudoku main past puzzles, times puzzles killer, sudoku uk, dkm sudoku, usa today sudoku, play soduko, killer sudoku tips, super sudoku puzzles, sudoku game rules, sudoku ki, extreme 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. I hope you enjoy these puzzles. Best regards, Basford Holmes