Even though I don't like - or even
use - tokens, I might as well propose something, since they're here, anyways. This thing could make some very evil puzzles: Tokens that turn tunnels 90 degress clockwise or counterclockwise. Before you know it, all the tunnels lead somewhere else, and when it comes to rotations like 90 degrees, you may not be able to leave through tunnels the way you came.
This would not only make some evil puzzles, but would also explore the characteristics of Tunnels.
---\
_____/ |
< -B >
~~~~~\ |
---/
Here, Beethro can't cross that path, because if he goes west while standing on a tunnel with an east opening, he'll warp. So he has to make that tunnel face north or south (or even west) so that he doesn't warp when we walks west across it.
So this not only makes odd puzzles with changing which tunnels connect where, but also which ones are forced to be entered.
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Also known as ExpHP everywhere else.