About Sun & Moon

Last updated: 20 August 2026

Sun & Moon — also known as Tango — is a free binary logic puzzle you can play in any browser. No download, no account, no paywall.

The game

Fill the grid with suns and moons so that every row and column holds an equal number of each. Never put three identical symbols in a line, and respect the markers between cells: = means the two cells match, × means they differ. Every puzzle has exactly one solution and can be reached by pure logic — you never have to guess.

Two ways to play

• ★ Daily Challenge — one 6×6 puzzle a day, identical for every player in the world. Solve it to build your day streak.
• ∞ Unlimited Levels — an endless ladder that starts gentle and works its way up to tough 8×8 grids.

What's included

• A global leaderboard for both modes.
• Hints that explain the reason a cell must be a sun or a moon, rather than just handing you the answer.
• Fifteen languages, with full right-to-left support for Arabic.
• Light and dark themes, and an installable version that works offline.

Who makes it

Sun & Moon is built and maintained by an independent developer. Advertising keeps it free for everyone — there are no paid levels and nothing is locked behind a purchase.

Get in touch

Ideas, bug reports and feedback are all welcome:

Play now →