When solving numberlink puzzles (it's probably the same with some other genres but cannot recall anything in particular) if I try to draw a long line I often get a lot of "side-tracks", which is really annoying. Not sure what the best way is to handle this. Increasing the size of the grid is one option (is this possible?), the other would be to make the interface less sensitive, i.e. you need to put your mouse closer to the middle of the edge to actually draw a line crossing this edge.