10×10 · Puzzle & Thinky on ArcadeOwl
Tap a cell to place a ☀️, tap again for a 🌙, once more to clear it.
Never put three of the same symbol in a row or column.
Each row and column must hold equal suns and moons.
Use those two rules to deduce forced cells.
✦ Uniquely-solvable sun & moon grids
✦ Logic-only — never a guess needed
✦ Best-time tracking