Tango puzzle tips and strategy

Rows and columns that already hold several symbols are where the no-three rule bites first. Two suns side by side immediately decide the cells next to them.

An = or × marker turns one known cell into two. When markers form a chain, a single symbol can travel across half the board with no guessing at all.

A pair of identical symbols forces the opposite symbol on both ends; two identical symbols with a gap between them force the opposite symbol into the gap. Scan every row and column for these after each move.

Each line needs exactly three of each symbol. Once three suns are in, the rest of the line is moons. With two of one symbol placed and only a few empty cells left, check which arrangements avoid three in a row: often only one does.

A × marker in a row means that pair holds one sun and one moon, whatever their order. Subtract it from the count and the remaining cells often fall into place.

Undo is free and unlimited, so it costs nothing to try a symbol and see whether the board breaks. Save Hint for the moment you are truly stuck; it fills one cell that the rules already force.