Few thoughts-

The dolls have to have a bigger part in someway, they don't really serve any kind of purpose.

The G11 upgraded is called the generator (maybe to charge the batteries, I think specifically the one downstairs in the spawn.

Maybe the raise hell (7th step) is to do the gersch step at the beginning or very end of a round and you have to kill a certain amount of zombies? Or a certain amount of monkeys (not sure how you could do the monkey one)?

Or something done during the monkey round, maybe with the dolls.

Or maybe that's it and it's over, but I hope not , I don't think the is an extra room or gun upgrade or anything but I do think there are other ways to continue or to get a new egg going.

I'm going to be on trying different idea's tonight, message me if you fit everyone else's criteria (Clip City (I'm on xbox).

I'll just keep updating this thread if I think of anything else.