The daily sun & moon logic puzzle
Fill the grid with suns and moons using pure logic. A new puzzle every day — the same board for everyone. Never guess.
Three simple rules
- No three in a rowNever three suns or three moons in a line, across or down.
- BalanceEvery row and column holds the same number of suns and moons.
- Connectors (= and ×)Later puzzles add clues between cells — same or different.
What is Solsticio?
Solsticio is a logic puzzle played on a small grid. Every cell holds a sun or a moon, and three rules decide which goes where: never three of the same symbol in a row, an equal number of suns and moons in every line, and — on later boards — connectors that tie two neighbouring cells together as the same or as opposites.
There is nothing to guess. Every board has exactly one solution and a path of deductions that reaches it, so when you get stuck the answer is somewhere on the grid, never in a coin flip. The puzzle is also known as Takuzu, Binairo or Binary Puzzle; the sun-and-moon version is the one most people meet first.
One board a day, the same for everyone
The grid you see today is generated from the date itself, so it is identical for every player in every country — no accounts, no difficulty setting, no personalised feed. Play it in the browser or in the free Android app, which serves the same daily board and works offline. Earlier days do not disappear: each one keeps its own page, and the archive goes back to the very first.
Where to start
- How to play The three rules and the controls, in about a minute.
- How to solve The deductions that take you from a stuck board to the answer.
- What is Takuzu Where the puzzle comes from and what it is called elsewhere.
- Past puzzles Every board since the first day, playable any time.