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If you enjoy daily logic games like LinkedIn's Tango or classic Binairo, this is the same pure-deduction habit — new puzzle at 00:00 UTC, unlimited free play any time. Sister puzzle: Gridlings, a double-constraint grid that runs on the same no-guessing guarantee.
Fill every cell with a sun or a moon so each row and column holds exactly three of each, and no three identical symbols sit adjacent horizontally or vertically. Tap a cell to cycle sun, moon, empty.
Yes — a new daily board goes live at 00:00 UTC, the same board for every player worldwide, with streak tracking. Unlimited free play in three difficulties and a full archive of past dailies are also free, with no account and no ads.
Yes. Every published board is machine-verified before release: a solver proves exactly one solution exists and is reachable by logical deduction, so there is always a provable next step.