Solsticio

Solsticio Daily Puzzle for Monday, September 28, 2026

Today's board is the same for everyone, everywhere. Solve it, keep your streak, and share your time — no spoilers.

Difficulty: Hard · 6×6

Tap a cell: empty → ☀ → ☾. Fill the grid to win.
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How today’s board is solved

Step by step, with no guessing. Every move below follows from the ones above it.

This board needs 28 deduced moves: 12 × line balance, 11 × no-three-in-a-row and 5 × contradiction.

Careful: this is the full reasoning. Play first if you would rather work it out yourself.
  1. B1 — the two cells before it are suns, and three in a row is not allowed, so it has to be a moon
  2. A3 — the two cells before it are suns, and three in a row is not allowed, so it has to be a moon
  3. D3 — the two cells before it are suns, and three in a row is not allowed, so it has to be a moon
  4. E3 — the two cells before it are moons, and three in a row is not allowed, so it has to be a sun
  5. B4 — the two cells before it are suns, and three in a row is not allowed, so it has to be a moon
  6. C5 — the two cells before it are suns, and three in a row is not allowed, so it has to be a moon
  7. F3 — that line already holds all the suns it can take, so the rest are moons
  8. B6 — that line already holds all the suns it can take, so the rest are moons
  9. A1 — putting a moon there breaks the board a few moves later, so it is a sun
  10. A2 — putting a sun there breaks the board a few moves later, so it is a moon
  11. A4 — the two cells before it are moons, and three in a row is not allowed, so it has to be a sun
  12. A6 — the two cells before it are suns, and three in a row is not allowed, so it has to be a moon

The remaining 16 moves follow the same way.

Three simple rules