Back story.
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So why are a lot of robots wandering around a really big cavern somewhere?
I assume by the lack of response to me post in the other forum that there isn't one? But why not? it does not have to be particularly good and it would really help the game. Provide inspiration for developing new features.
You could even have a competition, a years free subs for the best explanation for what's going on. Shouldn't break the bank.