Oh, I did not know of existence. But this upgrade was at least in game. I also upgraded and did not know how to find it and forgot about it.There's no ability to build another stage. I'm not sure where you're reading that. There ARE however, multiple stages to your station, but they don't function like your main level. If you zoom in on the central hole in your station, the main pillar, you'll go down to multiple extra stage where you can build some options that make you more money. I never mess with those, though, since their effect seems negligible.
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