Draw a non-intersecting loop through the centers of some cells that passes through every white circle and no black circles. Within a region, the loop must either turn on every white circle or pass straight through every white circle Solve on Penpa+ https://tinyurl.com/5cmj2hw5 Solve on Pzprxs (Puzz.Link Fork) https://tinyurl.com/3wy6nkf9
