Rules: Divide the grid into two connected regions — shaded (dark) and unshaded (light). Each numbered cell shows how many of its 4 orthogonal neighbors share the same color.
Controls: Click a cell to cycle: Empty → Shaded → Unshaded → Empty. Right-click or long-press to cycle backwards.
Tips: Clue "4" means all neighbors are the same color. Clue "0" means none are. Both regions must be connected to win.