Tango — also known as Binairo, Binary Puzzle, or Takuzu — is a logic puzzle played on a square grid. The goal is to fill the entire grid with two symbols (in this version, suns and moons) while following the rules you find below.

  • Fill each cell with either a sun or a moon.
  • No more than two identical symbols can appear consecutively in any row or column.
  • Each row and column must contain an equal number of suns and moons.
  • Cells connected by = must contain the same symbol.
  • Cells connected by × must contain different symbols.
  • Each puzzle has exactly one solution.