Takuzu, also known as Binairo, is a binary logic puzzle. You fill a square grid with 0s and 1s so that no three identical digits sit next to each other, every row and column holds equally many 0s and 1s, and no two rows or columns are identical. Every puzzle has exactly one solution.

Is it free, and do I need an account?

It is free and there is no account, no sign-up and no ads. Puzzles and your progress live entirely in your own browser, and a puzzle link contains the whole puzzle, so nothing is stored on a server.

Is there a daily puzzle?

Yes. Every day has one 8x8 puzzle, the same for everyone, generated from the date itself. Solving it records your time and builds a daily streak, and you can share your result without revealing the solution.

Do the puzzles ever require guessing?

Fair puzzles, the default, never do: they are generated so that every cell can be deduced step by step from the rules. Hard puzzles guarantee only a single solution, so reaching it may need trial and error.

Can I play a puzzle from a magazine or newspaper?

Yes. Photograph it and the grid is read directly in your browser, then you check the result and play. It handles printed 0/1 digits and black-and-white circles, and works on an angled or curved page. The photo is processed on your device and never uploaded.

Taku01zu

Free binary logic puzzles you can play in your browser. Fill the grid with 0s and 1s, no account, no ads, and a new puzzle every day.

Play today's puzzle Start a new game Scan from a magazine

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solvable by logic alone

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How to play

Fill every cell with a 0 or a 1 so that all three rules hold. Given digits are fixed, and every puzzle has exactly one solution.

No three in a row. Never three identical digits next to each other, in any row or column. 0111

Equal counts. Every row and every column holds as many 0s as 1s. 0110

No identical lines. No two rows are the same, and no two columns are the same.

Click selects · A / 0 sets 0 · S / 1 sets 1 · D / Backspace clears · M marks · Z undoes · Space cycles · arrows move · right-click clears

Frequently asked questions

What is Takuzu?: Takuzu, also known as Binairo, is a binary logic puzzle. You fill a square grid with 0s and 1s so that no three identical digits sit next to each other, every row and column holds equally many 0s and 1s, and no two rows or columns are identical. Every puzzle has exactly one solution.
Is it free, and do I need an account?: It is free and there is no account, no sign-up and no ads. Puzzles and your progress live entirely in your own browser, and a puzzle link contains the whole puzzle, so nothing is stored on a server.
Is there a daily puzzle?: Yes. Every day has one 8x8 puzzle, the same for everyone, generated from the date itself. Solving it records your time and builds a daily streak, and you can share your result without revealing the solution.
Do the puzzles ever require guessing?: Fair puzzles, the default, never do: they are generated so that every cell can be deduced step by step from the rules. Hard puzzles guarantee only a single solution, so reaching it may need trial and error.
Can I play a puzzle from a magazine or newspaper?: Yes. Photograph it and the grid is read directly in your browser, then you check the result and play. It handles printed 0/1 digits and black-and-white circles, and works on an angled or curved page. The photo is processed on your device and never uploaded.