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Three Degrees Of SudokuNumerate, are you? Find out with these Ninja Assassin Sudoku books of (248) puzzles--(2) per page, plus solutions--in 176-page paperbacks. You pick the White Belt (entry-level to medium), Yellow Belt (easy to easy-medium), or Green Belt (easy-medium to hard-medium). By Frank Longo from Puzzle Wright Press. Best part is you can ignore the $6.95 cover price.