ref: c3a5a7842eb6c41fb75a8a110a3f2cbc1c8fc5d9
dir: /html/palisade.html/
Palisade <p> Draw lines along the grid edges, in such a way that the grid is divided into connected regions, all of the size shown in the status line. Also, each square containing a number should have that many of its edges drawn in. <p> Click on a grid edge to mark it as a division between regions (black), and again to return to marking it as undecided (yellow). Right-click on a grid edge to mark it as definitely not part of the loop (faint grey), and again to mark it as undecided again.