Sun & Moon
Balance suns and moons · New puzzle every day · Free, no signup
About Sun & Moon
Sun & Moon is a free daily binary logic puzzle. Fill the grid with suns and moons so that every row and column is perfectly balanced. Each puzzle has exactly one solution.
How to play Sun & Moon
- Every square must hold a sun or a moon.
- No more than two of the same symbol may sit next to each other in a row or column.
- Each row and each column has the same number of suns and moons.
- No two rows are the same, and no two columns are the same.
- Tap a square to cycle: sun, moon, empty. Squares that break a rule get a red outline.
Tips for solving
Two matching symbols side by side must be surrounded by the opposite symbol. A gap between two matching symbols must be the opposite symbol too. Once a row has half its squares filled with one symbol, the rest must be the other.
Daily, Unlimited and Archive
Monday to Wednesday use a 6×6 grid; later in the week the grid grows to 8×8 with fewer starting clues. Keep practising in Unlimited mode or replay past days in the Archive.
Sun & Moon follows the classic binary puzzle rules, also known as Takuzu, Binairo or 0h h1.