Box Brain Sudoku
Rules › Hyper
How to play Hyper sudoku
Hyper sudoku, also called Windoku, shades four extra 3×3 areas that overlap the normal boxes, like the panes of a window.
Four extra boxes.
The rules
- Classic rules apply: every row, column and 3×3 box holds the digits 1 to 9 once each.
- The four shaded 3×3 areas also hold 1 to 9 once each.
Where to start
- Cells where a shaded area overlaps a normal box are heavily constrained. Look there first.
- The cells left between the shaded areas form hidden groups that also hold 1 to 9. For example, rows 1, 5 and 9 across columns 2 to 4 hold each digit once.
Play Hyper in Box Brain Sudoku
Every Hyper puzzle in the app has exactly one solution and can be solved by logic alone, from Easy to Expert. Stuck? A hint first nudges you towards the right area, then names the technique and shows the move.