Hyper Sudoku 6×6 Medium — Set 99
Solver Notes
6x6 Hyper at Medium. The non-standard window positions mean your Windoku intuitions may not apply directly — re-examine which cells overlap. 6-10 minutes.
Hyper Sudoku — Free Online & Printable
Hyper Sudoku is closely related to Windoku but places its four extra regions in slightly different positions. Like Windoku, it adds four 3x3 areas that must each contain digits 1-9, but the region placement creates different solving patterns. The name "Hyper" reflects the elevated difficulty that these particular window positions create — the constraints interact in ways that require careful cross-region reasoning. Hyper Sudoku puzzles at the same difficulty rating as Windoku often feel harder, making it a good progression challenge after mastering Windoku.
About 6x6 Grid
The 6x6 grid strikes a balance between accessibility and depth. With 36 cells in 2x3 boxes, puzzles take 3 to 10 minutes depending on difficulty. The 6x6 is large enough to showcase variant rules meaningfully — Killer cages have room to create genuine arithmetic puzzles, Windoku windows overlap in interesting ways — while remaining completable in a single sitting. Many players find the 6x6 their "daily driver" format: challenging enough to be satisfying, short enough to fit into a break.
Medium Difficulty
Medium difficulty requires applying variant rules in combination with standard techniques. You''ll need hidden singles (where a number can only go in one cell within a region, even if multiple numbers are possible for that cell) and basic elimination chains. For Killer Medium, expect some cage combinations where two or more possible sets remain and must be narrowed by row/column logic. Average time: 10-20 minutes for 9x9. Candidate notation is helpful but not essential.
How to Get Started
- Choose "New Puzzle" to generate a fresh puzzle with a unique solution
- Click or tap cells to enter numbers (1-6 for 6x6)
- Use the constraint highlights to track which numbers are still available
- Print the puzzle if you prefer solving on paper