Tango Puzzle — Complete Rules and Strategy Guide
The Tango puzzle is a binary logic game — the same family that puzzle players know as Binairo, Takuzu or the classic suns and moons grid. You are handed a square board and asked to put a sun ☀ or a moon ☾ in every single cell. There are only two symbols, but four rules that interact, and the interaction is what makes the puzzle so hard to put down. Every board on this page is generated on your device from a fully valid solution, so it is always solvable by pure logic and never needs a guess.
Tango Rules in Four Lines
- Equal counts. Each row and each column contains exactly as many suns as moons. On an 8×8 grid that is four suns and four moons in every line.
- No three in a line. You may never place three identical symbols consecutively in a row or column — horizontally or vertically.
- Every row and column is unique. No two rows may be identical, and no two columns may be identical.
- Markers always hold. A
=between two adjacent cells means those two cells hold the same symbol. A×means they hold different symbols.
How the Tango Generator Works
This is a fill-then-carve generator, and it runs entirely in your browser. Step one fills the whole grid with a valid sun/moon pattern that already satisfies equal counts, the no-three rule and unique rows and columns. Step two stamps = and × markers between adjacent cells that happen to be equal or different. Step three then removes cells one at a time, and after every single removal an independent solver re-checks that exactly one solution remains. The moment a removal would create ambiguity it is undone. The result is a Tango puzzle that is guaranteed solvable, guaranteed unique, and carved as aggressively as the rules allow.
Choosing Your Difficulty
Unlimited mode offers three sizes, and they feel completely different. A 6×6 grid is a three-minute puzzle where the sandwich rule and the half-full line do almost all the work — perfect for your first few boards. An 8×8 grid is the sweet spot: still readable at a glance, but long chains of markers start to matter. A 10×10 grid is a serious test where you have to track several lines at once and the unique-row rule starts doing real work. The daily Tango puzzle is seeded from the calendar date, so every player on the planet gets the same board on the same day.
Advanced Tango Tactics
- Work the edges first. Edge cells only have neighbours on one side, so a pair of identical symbols at the edge forces the single adjacent cell. Edges give deductions cheaply.
- Count before you place. A line with three suns and one moon on an 8×8 grid has exactly one sun left and four moons to fill. Counting beats scanning every time.
- Exploit the unique-row rule. Once a row is complete, no other row can match it. If a second row is identical apart from one cell, that cell is decided.
- Chain markers deliberately. A run of alternating
=and×markers propagates a single known value across an entire stretch of the grid in one pass. - Use vertical pairs too.The sandwich rule works exactly the same in columns, and it is far easier to miss. Scan the grid both ways after every move.
Why Play the Tango Puzzle Unlimited?
A daily binary puzzle is a lovely five-minute ritual, but real skill comes from volume. Unlimited mode lets you clear board after board until the pair-sandwich and half-full-line moves become automatic, which is exactly what you need when the daily Tango puzzle turns out to be sparser than usual. The binary puzzle format is one of the purest logic games in existence — two symbols, four rules, zero luck — and every generated board here is verified unique before it reaches you. No account, no paywall, no download, works on any device.
