Guide
How to play Soluna
Soluna fills a grid with suns and moons. Each row and column must contain equally many of each symbol, three identical symbols cannot sit in a line, and the = and × badges on the edges force a pair to match or to differ. It is binary parity logic wearing a friendlier costume.
Rules
- Fill with equal suns and moons — You may place ☀️ and 🌙 so every row and column has the same count of each. On 6×6 that is three suns and three moons per line.
- No three identical symbols in a row — You cannot put three suns or three moons consecutively horizontally or vertically. Two suns force moons on both open ends.
- Honor = and × badges — Squares joined by = must match. Squares joined by × must be opposites. Tap cycles Empty → Sun → Moon.
- Do not break a finished count — Once a line already has its half of suns, you cannot add another sun there. The rest of that line must be moons.
Tips
- Two in a row forces the ends — ☀️☀️ in a line must be flanked by 🌙. Same for moons. Paint those immediately.
- Count to half — On 6×6, three suns in a row means the rest of that row is moons. Finish the count before chasing badges.
- Follow = chains — A run of = badges is one symbol. If any cell in the chain is known, copy it through the whole chain.
- × is a toggle — If A × B and A is a sun, B is a moon. Chain × through a line to fill several cells at once.
Where it comes from
The core logic is Takuzu, also sold as Binairo: a binary grid with no three-in-a-row and an equal count of 0s and 1s in every line. Restyling the bits as sun and moon, then adding equality and opposite badges between neighbours, is what turned it into a daily. Soluna is Coronet Arcade’s board in that line.
How it differs from similar puzzles
Classic Takuzu and Binairo usually omit the = and × badges, so every deduction comes from counting and the no-three-in-a-row rule alone. Larger Soluna practice boards, up to 10×10, are the same rules with a longer count to half. The badges are what let smaller grids stay interesting.
Also known as
Also searched as Takuzu, Binairo, a binary puzzle, or a sun and moon puzzle. Soluna is the Coronet title.
- Takuzu
- Binairo
- Binary puzzle
- 0h h1
- Sun and moon puzzle