Binary
Also known as Takuzu, Binairo, Unruly or the binary sudoku-style puzzle.
Fill every square with a 0 or a 1 under three rules: never three of the same in a row, an equal count of each in every line, and no two rows — or two columns — identical. Every board we serve has been solved in advance by a logic solver that only ever makes forced deductions, so you never need to guess and try. If the logic runs out, we throw the board away and build another.
Daily Puzzle
Settings
Solvable by logic alone ✓
Solved!
How to play Binary — the rules
- Goal: fill every square with 0 or 1.
- Tap a square to cycle it: empty → 0 → 1 → empty. Squares that were filled in from the start cannot be changed.
- No three of the same number in a row, horizontally or vertically.
- Each row and each column holds the same number of 0s as 1s.
- No two rows may be identical, and no two columns may be identical.
Keyboard: arrow keys to move, Enter or Space to cycle, 0 and 1 to place directly.
What the badge means: an independent solver plays the board using only deductions a person can make — three-in-a-row, counting, and the no-duplicate-lines rule. A board is served only if that alone finishes it. Because every step is forced, finishing this way also proves the solution is the only one.
Strategy and tips
Frequently asked questions
What is the Binary puzzle?
A grid you fill with 0s and 1s under three rules: never three alike in a row, equal counts of each in every line, and no two rows or columns identical. It is also known as Takuzu, Binairo or Unruly.
Do I ever have to guess?
No. Before a board is served, an independent solver works through it using only forced deductions — the kind you can make yourself. If that is not enough to finish the board, the board is discarded and a new one is built.
How do you know there is only one solution?
It follows from the way we check. Every rule the solver uses only ever concludes something that must be true in any solution. So if those deductions alone fill the whole grid, no other filling could have existed.
Why did a row turn red?
That line already breaks a rule — three alike in a row, too many of one number, or a duplicate of another finished line. We only flag it once it is definitely wrong, never while the line still has empty squares.
Is the daily board the same for everyone?
Yes. One board is generated each day from a public seed, and every player worldwide gets exactly the same one. It changes at midnight in your local time.