A Pentadoku is five sudokus in one, which of course gives the reader a challenge that will last for hours.

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Even though Pentadoku requires real staying-power, you are helped by fact that the five sudokus have overlapping corners. When you’ve solved a Pentadoku, you feel a real sense of achievement!

Pentadoku is available in two difficulty levels: Medium-hard and Hard.

Pentadoku, Sudoku