Yeah, it's a bit of a pain in the ass. You have to die and get the whole b&w floating mask thing, which is unfortunately random, so a lot of my attempts just end right there due to bad luck. You also have to trigger all 16 masks (not the "real" mask in Zhao's room, for some reason), and it's easy to miss one if you're trying to be fast (especially the triple in engineering and the pair in the lab).

Can there be a category for the third ending (with the masks)? My time for that one is actually better than the other two, surprisingly.