The one I had in mind was daisychainrpg. I had a character I was thinking of apping, but I wouldn't really want to play her in this setting without the development she got there. The basic idea is that an evil slushie corporation was pulling people out of their universes with a dimensional thingamajigger-whatsit and trapped them in an "empty" universe that they modeled to look like Manhattan. This is the writeup the moderators did on how alternate universes worked within the game's setting, if that helps!
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The one I had in mind was