Take your sudoku to the NEXT LEVEL with these challenging puzzle variations: Sudoku XHyper SudokuSudoku TwinsTriathlon ATriathlon BMarathonSamurai12x1216x16 David Karn Sudoku comes in many other editions as well. VARIETY OF LEVELS: David Karn sudoku books are available in one or a mix of several levels of difficulty. There are six levels (Beginner, Easy, Medium, Hard, Very Hard, and...
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