Divide the grid into regions so that each region is 180-degree rotationally symmetric around its galaxy dot, and every region contains exactly one dot.
Click or tap on the edges between cells to toggle walls on or off. A wall separates two cells into different regions. Remove walls to connect cells into the same region.
1. Every cell must belong to exactly one region.
2. Every region must contain exactly one dot (galaxy center).
3. Every region must be 180-degree rotationally symmetric around its dot.
Start from the dots and work outward. Each cell you add to a region must have a partner cell on the opposite side of the dot. Use the Check button to see incorrect walls highlighted in red. Use Hint to automatically fix one wall.