Number & arithmetic
Binairo — rules and where to play
BINAIRO · Binary Puzzle / Takuzu / Binero / Bit Puzzle
Only 0 and 1. Each row and column holds equal numbers of both, and three identical digits may never sit in a row. Three rules, and it scales from 4×4 all the way to brutal 20×20 grids.
- Origin
- 2004 · Belgium
- Difficulty
- ★★★★★ 1–4 / 5
- Time
- 3–25 min
- Grid
- 4×4 – 20×20
- Sites
- 2
Rules
- Every cell holds 0 or 1.
- Each row and column contains equal numbers of 0s and 1s.
- No three consecutive cells may hold the same digit, horizontally or vertically.
- No two rows are identical, and no two columns are identical.
How to start
The three-in-a-row ban is your best tool
See 00 and both ends are 1; see 0_0 and the middle is 1.
Use the count balance
On an 8-wide row with four 0s placed, everything else is 1.
Uniqueness saves the endgame
When two rows look possible, one usually duplicates another.
Where players get stuck
- Forgetting no-two-rows-alike, which leaves the puzzle with several solutions.
- Remembering the rule as "two in a row" instead of three.
Play Binairo
2 sitesAlso on multi-type portals
Related puzzles
About this page
- Last updated 2026-09-22
- Source Curated compilation of established puzzle rules and listed third-party play sites
- Audience Players learning Binairo rules or looking for online sites to play
- Covers Rules summary, how to start, common pitfalls, and the dedicated play sites listed on this page
- Does not cover Hosted puzzles, worked solutions, official contest rankings, third-party uptime or pricing guarantees
- Not advice This page is puzzle reference content only. It does not constitute financial, legal, medical or other professional advice.
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