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Hyper Sudoku (Windoku)
Play Hyper Sudoku, also called Windoku: classic rules plus four extra shaded 3×3 regions that must each contain 1–9.
Hyper Sudoku — also known as Windoku or NRC Sudoku — overlays four extra 3×3 regions on the classic grid, offset by one cell from the corners. Each of those shaded windows must also contain 1 to 9 exactly once.
Because the windows overlap the normal boxes, cells inside them gain powerful extra eliminations. Hyper rewards solvers who keep an eye on the overlay as well as the standard grid.
Rules
- All classic Sudoku rules apply.
- Four extra 3×3 windows (offset one cell from each corner) each contain 1–9 once.
Frequently asked questions
What is Hyper Sudoku?
Classic Sudoku plus four additional 3×3 regions, offset from the corners, that each must contain 1 to 9. It is also called Windoku.
Where are the extra regions?
They sit one cell in from each corner of the grid, overlapping the standard boxes — that overlap is what creates the extra deductions.
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