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How to play
- Fill the board with suns and moons : click a cell to cycle between them or clear it.
- Every row and every column contains exactly three of each symbol.
- Three equal symbols in a row are never allowed.
- An = between two cells means they hold the same symbol; an × means they hold different symbols.
- Every puzzle has a unique solution and can be solved by pure deduction.
Based on the classic logic puzzle Takuzu.