You can just make the spar rooms their own server and going through the door changes the server you're on. With towers being incorporated into the overworld, there would be caveats doing the same for them.
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but when u are switching the server, doesn't that going to take at least 10 seconds? Just walking through a wrong door and you have to waste 20 seconds to come back.
that's how long it took to switch from idev to fb server and we are talking about 2012. less than 2000 players active both fb and idev combined.