How to play binary puzzle

The whole idea

Every row and column needs equal suns and moons. Never place three of the same symbol in a row.

Find your next move

No two completed rows can match. No two completed columns can match either. Look for pairs: two suns beside each other need a moon next.

Make it yours

Choose Sun or Moon, then tap an empty square. Locked clues have a small diamond. Arrow keys move, 1 places a sun, 2 places a moon, and Delete clears a square.

Everyone gets the same daily puzzle at midnight UTC. Your progress stays in this browser. Levels give you another board whenever you want one.