How to Play the Binary Puzzle
The binary puzzle (also called Takuzu, Binero or "0h h1" style) is a grid of 0s and 1s with three simple rules and no arithmetic.
The rules
- Every cell holds a 0 or a 1.
- Each row and each column contains equally many 0s and 1s (three of each in a 6×6, four in an 8×8).
- No three of the same digit are next to each other in a row or column.
- No two rows are identical, and no two columns are identical.
Some cells are given. Fill in the rest.
Playing on kawu
- Tap a cell to cycle 0 → 1 → blank. With a keyboard, type 0 or 1, Backspace to clear, arrows to move.
- Cells that break a rule are underlined in red.
- The hint fills one cell that the rules decide from what you have so far.
- Sizes: 6×6, 8×8 and 10×10. The daily puzzle is 8×8 and the same for everyone.
Frequently asked questions
Can two 0s be next to each other in a binary puzzle?
Yes. Two of the same digit may touch; three in a row (across or down) may not.
Does the binary puzzle need guessing?
Not on kawu. Every puzzle is generated so that the three rules, applied one cell at a time, fill the whole grid. There's always a cell you can work out.
Last updated 2026-10-20