Some careful displacement work on pl_descend's remake... Also, I'm afraid I'll get a lot of frustrated players because of low rooftops with clipping all over them, like in the MVM maps.
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The main prollybremblem with Coaltown's Roofs is that they don't look any different from the walkable parts. Most players won't be confused if you just put SOMETHING on the roofs to make it look out of bounds. Coaltown has some roofs that look like you could just jump on them with any class, mainly the one building with the side entrance for the robots to it. Any players will know what I am talking about when I say that building is annoying and horrible.
TL;DR Just make the roofs look like somewhere you can't go.