Hihi,
If I may ask, if I'm not already too late, what keys do you actually already have so far?
A000 and !000.
Edit: They're the ones you buy the hint for and the one ultimately accessible from the red/blue tile room respectively.
One of the missing ones you get from a Styx F1 backstage, but I haven't found the fourth yet
That's what I thought was the case. Good[?] to know it's a thing I'll have to do over multiple runs, I guess.
