How to play
Connect every firefly into one continuous loop.
- Each circle is a firefly; the small black dot is its tail.
- From every firefly, draw a line that leaves through its tail and enters another firefly from a non-tail side.
- The number inside a firefly is the number of 90° bends in that firefly's outgoing line. A blank circle means any number of bends is allowed.
- All the lines together must form one continuous loop visiting every firefly exactly once.
- Lines may not cross, branch, share a segment, or pass through another firefly.
Controls
- Drag between adjacent grid points to draw a segment.
- Drag back over a segment to erase it.
- Clear wipes the board. Check tells you what's wrong.