whatsnottaken: I think it's the 5th level, you start in a small area, and above you are three mirrors with numbers beneath as if they were for sale or something. I can't find a way into the res of the level, I know there are hidden walls sometimes so I charged up my fireballs and shot around but couldn't find anything.

Is there one specific place I didn't shoot at? I feel like I've covered the whole room facing a wall, charging up and shooting it, taking one step sideways and repeating. You can actually see floor beyond the wall on the bottom of the screen, but it doesn't break there either.

So what stupid, obvious thing am I missing? So far the only challenge was staying alive with super fast demons all around me, so this is kinda throwing me off.