Not trying to burst your bubble but I didn't hear of that nor am I working on that. If anyone is, it's not me and not to my knowledge.
Jeff worked on mirrored maps back in 2017 but didn't finish it.
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Well, than I guess I remember that, would it be hard to add another map like Stairway, or mirror it? Also, a small side-note suggestion, you think you could add more space in Stairway before we fall into the oblivion? It would make many more tricks possible I think, especially around the bridge area!