I know this idea has been mentioned a while ago but I think it's a good idea to bring it up again, I just think it would be a great addition for the game, both or at least one of the two. Subways would add a completely new environment to explore, there could be potential murders on the subway or maybe push someone onto the tracks, taxi rides would be epic, I could keep going but I think you guys get the jist. For smaller maps though, I don't think the map would need subways/taxis since you can just walk across the whole map in like a minute.
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