Take your Sudoku to the NEXT LEVEL with these challenging puzzle variations: Sudoku X Hyper Sudoku Sudoku Twins Triathlon A Triathlon B Marathon Samurai 12x12 16x16 David Karn Sudoku comes in many other editions as well.
There are.
VARIETY OF LEVELS: David Karn Sudoku books are available in one or a mix of several levels of difficulty.
Take your Sudoku to the NEXT LEVEL with these challenging puzzle variations: Sudoku X Hyper Sudoku Sudoku Twins Triathlon A Triathlon B Marathon Samurai 12x12 16x16 David Karn Sudoku comes in many other editions as well