// How to play
Connect each pair of pads sharing a net label. Traces run between neighbouring cells, and two different nets can never share a cell on the same copper layer.
- Drag from a pad to its partner.
- Drag back over a trace to retract it.
- Start on a pad of a routed net to re-route it.
- Right-click or long-press a net to erase it.
// Two layers · board 09+
While drawing, drop a via — Space, the ⦿ button, or double-tap the trace end — to dive to the bottom layer. Traces on different layers may cross. Chips block only the top layer, so you can route under them; holes and keep-outs block both.
Pads are plated through-holes: a trace can start or end on either layer. Pick F.Cu or B.Cu (L) before you start dragging.
// Score
Cost = trace length + 2 per via. Hit par for ★★★. Par comes from the solver — a * marks a best-known, not proven-optimal, par.
// Keyboard
- ←↑→↓
- move cursor / extend
- Enter
- start / finish trace
- Space
- via
- ⌫
- step back / erase net
- L
- switch layer
- CtrlZ
- undo
- R
- reset board
- N
- next (when solved)