ck5_map.c
I've added the world map elevator, but there are two problems:
1) The scrolling is messed up.  This is in addition to the existing scrolling problem that doesn't let you scroll all the way to the right if you move left on the world map.
2) After inspecting the memory with the debugger, the game is not loading the proper infoplane value into the elevator tiles at x = 0x16, y = 0x38.  This does not let keen return to the elevator after level two.

I have no idea why either of these problems are occurring.