Windoku
Sudoku with four extra shaded 3 by 3 windows that must each hold 1 to 9, also known as Hyper Sudoku.
- Logic
- New puzzle every day
- Free, plays in your browser
- Mouse, touch or keyboard
- Added 29 October 2026
- #sudoku
- #windoku
- #hypersudoku
- #dailypuzzle
- #logic
- #relaxing
Windoku
0% · Getting ready
Loading Windoku 0%Watch a 20-second trailer
A real run of the game, recorded with captions and no sound.
How to play
- Fill the grid so every row, column and 3 by 3 box holds 1 to 9 once.
- In this variant, the four shaded 3 by 3 windows must each hold 1 to 9 as well.
- Tap a cell, then a number. Notes mode lets you pencil in candidates. Conflicts show in red as you play.
- Pick Daily for today's puzzle, the same for everyone, or Easy and Hard for fresh ones. Your time is saved when you finish.
Controls: mouse, touch or keyboard. Made by CalcoTools.
Tips and strategy
- The windows overlap the boxes, so one digit often settles two groups at once.
- Start with the cells in a window and a box together. They have the fewest candidates.
- Mark a digit's spot in a window with a note, then look for the same digit in the boxes it overlaps.
- Check the shaded cells in the middle box: they belong to all four windows' corners.
FAQ
- Which cells are in the windows?
- Rows 2 to 4 and 6 to 8 crossed with columns 2 to 4 and 6 to 8, shown in a light tint.
- Is this the same as Hyper Sudoku?
- Yes. The rule has several names.
- Is the daily the same for everyone?
- Yes, on the same UTC day.
Similar games
Something not working? Report a problem with this game.