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The different game worlds are the different versions of AE. 
* SIM1: Sim 1 is the oldest version of AE, it is also the first one to be created. Sim 1 has no support and does not get any new features since the only one with admin powers is miller who is not around anymore. This is one of the two sims that run a real life production game with start and end dates.

* SIM2: Sim 2 is a almost stand still version with very little bugs and very little new features. It does have some support however and unlike sim 1 it does not run a real life production system.

* SIM2 BETA: Sim 2 Beta is the newest and most advanced game. It has lots of support, more features and runs a real life production game. There are multiple bugs so it is reset more frequently than any other sim but it does go faster and allows faster growth.

* SIM3: Sim 3 is a competitive and fast stand still game. There are little to no bugs and runs a 1 - 10 year game. It has some support but never gets any new features.