August 4, 2026
Daily
Play Binairo free online. A new daily binary puzzle every day, plus 600 unlimited Takuzu grids from 6x6 to 14x14. No signup, works on mobile.
Fill every cell with a 0 or a 1 (or white and black circles, if you prefer the classic look). Tap a cell to cycle: empty → 0 → 1 → empty.
No three in a row: three identical digits may never sit consecutively, horizontally or vertically. Two is fine — a pair always gets capped by the opposite digit.
Balance every line: each row and each column contains exactly as many 0s as 1s — half and half.
Unique lines: no two rows may be identical, and no two columns may be identical. On hard boards this rule is the key that unlocks the finish.
The board is solved when every cell is filled and all three rules hold. There is always exactly one solution, and it never requires guessing.
Binairo — also known as Takuzu, Binero, Binoxxo, or simply the binary puzzle — is a logic game played on an even-sided grid that you fill with 0s and 1s. Three rules govern every board: no three identical digits may sit side by side in a row or column, every row and column must contain equally many 0s and 1s, and no two rows or columns may be exactly alike. From a handful of given digits, those three rules pin down one — and only one — solution.
The appeal is the purity. There is no arithmetic, no vocabulary, and no guessing: every cell on every board we publish is reachable by a chain of small, checkable deductions. Easy boards yield to spotting pairs and counting a line's quota. Medium boards ask you to reason about how a whole row could legally be completed. Hard boards go one further and require the duplicate-line rule itself — comparing a nearly-finished row against completed ones to rule a candidate out.
Binairo Puzzles publishes a new daily board every midnight (US Eastern), the same for every player, alongside an unlimited collection of 600 technique-graded puzzles across five grid sizes, from a two-minute 6x6 to a marathon 14x14. Play with digits or with Binairo's traditional black-and-white circles, on any phone, tablet, or desktop — free, with no account and no downloads.
If you enjoy Sudoku's logic but want something you can learn in a minute, or you know this format from LinkedIn's Tango and want the classic, sign-free version at real sizes, this is the place to start.
A new puzzle every day
One fresh binary puzzle daily — the same board for everyone, so times are comparable.
600 unlimited boards
Five grid sizes from 6×6 to 14×14, three technique-graded difficulty tiers.
Logic only, never guessing
Every board is verified solvable by pure deduction with a single solution.
Digits or circles
Play with 0s and 1s or switch to Binairo's traditional black-and-white circles.