A logic puzzle without a single number.
Every region turns onto itself around its own circle — and that alone decides where each line goes.
Arrow keys move the cursor. Shift and an arrow key draw or remove the wall on that side of it.
The rules
- Divide the grid into regions along the grid lines. Every square belongs to exactly one region.
- Each region holds exactly one circle and is point-symmetric about it: turn it half a turn around that circle and it lands on itself.
- A circle sits in a square, on the line between two, or on the corner between four. Every square it touches belongs to its region — that is always the first step.