Tango is a little logic puzzle about balance. You fill a grid with suns and moons so every line is even, nothing runs three in a row, and the signs between cells are obeyed.
The rules
- Fill every cell with a sun or a moon.
- Each row and column has equal numbers of suns and moons (three of each on a 6×6).
- No more than two of the same symbol next to each other, across or down.
- Cells joined by = are the same. Cells joined by × are opposite.
Your first moves
Follow the signs
Signs are the quickest wins. If one side of an = is a sun, the other is a sun. If one side of a × is a moon, the other is a sun.
Break up pairs
Two suns side by side? The cells on either end of the pair must be moons, otherwise you'd have three in a row. The same goes for moons, and for columns.
Fill the gap
Two of the same symbol with one empty cell between them (sun, gap, sun)? The gap must be the opposite symbol.
Count to finish a line
A 6×6 row needs exactly three suns and three moons. As soon as a row has three suns, every empty cell in it is a moon.
Where Tango comes from
The rules come from Binairo (also called Takuzu or binary puzzles), invented in Belgium and Italy around 2009 and a staple of Dutch and Belgian puzzle magazines. LinkedIn launched its sun-and-moon version, Tango, in October 2024 and added the = and × signs.