Parallel universe

The parallel universe is the universe Larry originated from aka Sierra World. He mysteriously was brought to our earth through a magical portal on Nontoonyt Island. The parallel universe is close to our own.

Earth is a parallel universe to Larry's universe.

Multiple parallel universes make up the Multiverse.

WD universe
The Wet Dreams universe takes place in yet another parallel universe to that of the original series. The original games exist telling the old aventures, but which happened in a separate 'parallel universe' (that time traveling Larry does not remember).