The blue key doesn't seem to be appearing for me. I've looked at a few walkthroughs and it seems to be broken? I dunno.

It's supposed to spawn in the yellow room yeah? for some reason it's not doing that. Plus I've looked all over the level besides that, even in the lava.

Same for me. :( I did not have a good save so had to go far back. :( Please fix this bug!

Originally posted by Emblem Parade:

Same for me. :( I did not have a good save so had to go far back. :( Please fix this bug!

Sigh, it's hard being dumb. :) After going through the previous level again and reaching the Erebus Reactor ... I realized that there are in fact TWO yellow doors. The blue key was indeed behind the second one I tried.

So, no bug, just impatient gamer...