About the game
Four tinted windows sit between the boxes, and each of them must hold 1 to 9 too. They overlap the ordinary boxes, so every number has more places to clash and more to tell you.
Rules
Fill the grid so that every row, every column and every 3×3 box holds each number from 1 to 9 exactly once.
The four tinted 3×3 windows also hold every number from 1 to 9 exactly once.
Every puzzle has exactly one solution, so it can always be found by reasoning, without guessing. A number that breaks a rule turns red.
How to play
- Tap a cell, then a number below the board (or type it).
- The four tinted windows hold 1 to 9 once too.
- Not sure? Switch on notes and pencil in the options.
- Languages
- EN · DE
- Works on
- Phone, tablet, computer
- Players
- Just you