I think I have found a hub that leads to level 0,1, and 2. There are more doors, but they're blocked off : r/backrooms
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-106-p.jpg?v=27112021-120343 "Level Front and Rear Track Hubs")
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-104-p.jpg?v=7b423a60-2e4d-481d-bc42-acca2410837b "Level Track Hub Front")
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