Windoku (Hyper Sudoku)
Windoku (sometimes called Hyper Sudoku) adds four shaded "window" regions to the classic rules; each of these regions also contains 1-9 once.
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Windoku (Hyper Sudoku) rules
- 1Rule 1
The classic row, column, and 3x3 box rules apply as usual.
- 2Rule 2
Four shaded 3x3 window regions sit on top of the grid.
- 3Rule 3
Each window region also contains the digits 1-9 exactly once.
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