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Sun and Moon icon

Puzzle game · Android

Sun and Moon: Binary Puzzle

Fill the grid with suns and moons so every row and every column holds as many of each, and never put three of the same side by side. Each board has exactly one answer, and you can reach it with logic alone.

Get it on Google Play
Android 8.0 or newerWorks offlineNo accountFree with ads
A Hard 8x8 board half filled, with the = and × signs between cellsA 6x6 board solved in 2:14 with a six day streakA hint on the daily board that explains the × sign before you tap ApplyHome screen with the daily puzzle, the streak and the four packsAn Expert 10x10 board with a hint about the = signA Medium 6x6 board in the dark Twilight themeA soft red stripe where three suns sit side by sideThe Easy 6x6 pack with the solved puzzles ticked
Real screenshots from the app. Scroll sideways to see them all.

How it plays

Tap a cell once for a sun and again for a moon. A long press clears it. Undo goes back as far as you like, and on the bigger boards you can pinch to zoom.

Then there are the little signs between some cells. An = means the two cells match, and a × means they're different. Two or three signs in a row can settle half a line before you've placed anything. If you know takuzu or binairo, it's the same kind of puzzle with friendlier pieces.

What's in the game

800 boards in four packs

Easy 6x6, Medium 6x6, Hard 8x8 and Expert 10x10, with 200 boards each. I ran every one through a solver that thinks the way a person does, so none of them need a guess. Easy boards only need the basic rules. On 10x10 you'll be weighing whole rows before the next cell gives way. Nothing is locked.

A daily puzzle

Everyone gets the same board on the same date. It's 6x6 from Monday to Wednesday, 8x8 from Thursday to Saturday and 10x10 on Sunday. Solve it each day to grow your streak.

Hints that explain the step

A hint marks the cells that matter and says why in one sentence, like "This column already has 3 suns. Both empty cells are moons." You tap Apply once it makes sense. Hints are unlimited and never come with an ad.

No lives

Mistakes don't cost you anything. With the row and column check on, a broken rule gets a soft red stripe and a short note. Turn it off and the app only checks once the board is full.

Day and Twilight

Day has warm cream cells, amber suns and indigo moons. Twilight is the dark theme, and it turns on by itself in dark mode. Color blind mode adds patterns to the suns and moons.

Questions

Is Sun and Moon free?

Yes. It's free to download and supported by ads. A small banner sits on the home and solved screens, and a full screen ad may show after some solved puzzles when you tap Next. You won't see one while you're solving. One purchase removes all ads.

Does it need the internet?

No. All 800 boards and the daily puzzle work offline, and there's no account or sign in.

How do I learn the rules?

The first time you play, three tiny boards show you the count rule, the no three rule and the signs. It takes about a minute. After that, a 6x6 board takes a couple of minutes.

Which languages does it support?

The game is in English for now.

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