Yin Yang
Fill every cell black or white so each colour forms one connected group — and no 2×2 is one colour.
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How to play
Click a cell to set it black or white. Keep each colour in one connected group and avoid any solid 2×2 block. Fill the whole grid, then press Verify.
About Yin Yang
Yin Yang is a two-colour connectivity puzzle: colour every cell black or white so all the black cells connect into a single group, all the white cells do too, and no 2×2 block is entirely one colour. Simple rules, surprising depth.