The board starts with Red (R), Green (G), and Blue (B) tiles.
Click a non-empty tile, then an adjacent tile (up / down / left / right) to
mix them. The first tile becomes empty, and the second tile becomes the
result of the mix.
Mix rules:
– Same color + same color → same color (R+R=R, G+G=G, B+B=B, …)
– R+G → Y (Yellow), R+B → P (Purple), G+B → C (Cyan)
– Y+B → W, P+G → W, C+R → W (White)