Binairo vs Tango: Is Tango Just Binairo With Symbols?
If you solved binary puzzles in a newspaper years before LinkedIn existed, Tango will look instantly familiar. It is the same family — but there are two specific rule differences worth knowing before you assume your habits transfer.
Where the puzzle came from
The binary puzzle was not invented once. It appeared in two places more or less simultaneously: Italian inventor Adolfo Zanellati created a version called Tohu wa Vohu, and in Belgium Peter De Schepper and Frank Coussement created Binairo in 2009.
Since then it has travelled under a remarkable number of names depending on the publisher and the country: Binairo, Takuzu, Binary Sudoku, Tic-Tac-Logic, Binoxxo, Binero, Tohu-Wa-Vohu. In France it is usually Takuzu, and it runs in newspapers including Le Figaro. The genre is well over a decade older than any app that made it popular.
This matters for one practical reason: if you search for the puzzle by the wrong name you will conclude there is nothing to play. There is a lot to play — it is just filed under six different labels.
The rules they share
Both puzzles fill a grid with two symbols, and both enforce the same two core constraints:
- Balance — every row and every column contains an equal number of each symbol.
- No three in a row — you may never have more than two identical symbols touching in a straight line.
If you know those two rules you already know most of both games. The techniques transfer directly: counting a line once it holds half of one symbol, and the sandwich pattern where two identical symbols with a gap between them force the opposite into the middle.
The two differences that actually matter
Binairo has a rule Tango drops
In Binairo, no two rows may be identical, and no two columns may be identical. This is a genuinely different kind of deduction — it compares whole lines against each other rather than reasoning within one line. On a 10×10 Binairo board it is often the rule that breaks a deadlock late in the solve.
Tango does not have this rule. Two rows of a finished Tango board may be exactly the same, and that is legal.
Tango has a rule Binairo does not
Tango adds pair clues on the edges between cells. An = between two neighbouring cells means they must hold the same symbol; an × means they must differ.
These change the texture of the puzzle more than they might sound. Binairo deductions all come from counting and adjacency within a line. Tango's clue markers create chains that run across lines: a known cell resolves an =, which gives you its neighbour, which satisfies an × two cells further along, which completes a pair, which triggers a sandwich elsewhere. On harder boards this chaining is usually the only way in.
Rule comparison at a glance
- Symbols — Binairo uses 0s and 1s (or black and white); Tango uses suns and moons. Cosmetic only.
- Grid size — Binairo is commonly 10×10 or larger and always even-sided; Tango is fixed at 6×6.
- Balance rule — both have it.
- No three in a row — both have it.
- No duplicate rows or columns — Binairo only.
- = and × pair clues — Tango only.
Which is harder?
Neither, straightforwardly. Binairo boards are bigger and the no-duplicate-lines rule forces you to compare whole lines against each other, which is a wider kind of attention. Tango stays small and local, but the pair clues create chains that Binairo has no equivalent for, and a well-built hard Tango board deliberately withholds the easy counting moves.
What is worth saying plainly: a bigger grid is not automatically a harder puzzle. Difficulty comes from how far you get before the obvious moves run out — which is exactly how the boards here are graded. Our difficulty page explains the screening process.
Coming from Binairo or Takuzu? The counting and sandwich habits transfer straight over. The pair clues are the only genuinely new thing to learn, and they take about one board.
Play Tango freeFrequently asked questions
Is Tango the same as Binairo?
Same family, different rule set. Both fill a grid with two symbols, balance every row and column, and forbid three identical symbols in a line. But Binairo also forbids any two rows or columns from being identical, and Tango does not. Tango instead adds pair clues: an = between two cells forces them to match, an × forces them to differ.
What is Takuzu?
Takuzu is another name for the same binary puzzle. The genre travels under many names depending on the publisher and country — Binairo, Takuzu, Binary Sudoku, Tic-Tac-Logic, Binoxxo, Tohu-Wa-Vohu. In France it is usually called Takuzu and appears in newspapers such as Le Figaro.
Who invented the binary puzzle?
It appeared in two places at once. Italian inventor Adolfo Zanellati created a version called Tohu wa Vohu, and in Belgium Peter De Schepper and Frank Coussement created Binairo in 2009. The genre predates any particular app or platform by well over a decade.
Is Binairo harder than Tango?
Binairo boards are usually larger, often 10×10 or more, and the no-duplicate-lines rule creates deductions that span the whole grid. Tango stays at 6×6 and keeps deductions local, but its pair clues create chains that Binairo has no equivalent for. Bigger is not automatically harder — they are hard in different directions.