RSW

Is every RSW map a planar graph? I assume so, but one of my maps is being difficult.

Technically, every map is spherical, which means that topologically it is also planar, especially if you are allowed to bend the arcs between worlds. Since you can't bend them, it might be necessary to pull the map really, really big at the extremities in order to avoid crossing lines.

I usually surrender at around that point and allow a few lines to cross at strategic places.

David