Spiral Galaxies
Also called Tentai Show
Split the grid into regions that look the same turned halfway round their circle.
Rules
Every region holds exactly one circle.
✗ Two circles Each region is symmetric about its circle: turn it halfway round and it looks the same.
✓ Symmetric ✗ Lopsided
Example: Pinwheel
Playing here: Drag along the lines between cells to cut, or pick a color and paint cells into a group.