Yin Yang

1. Fill every cell with yin (dark) or yang (light).
2. Each row and column has the same number of each.
3. No three in a row of the same symbol, across or down.
4. Cells joined by = match. Cells joined by × are opposites.

Tap once for yang, twice for yin, again to clear. Shaded cells are fixed. Every board has one solution.