It doesn't give a "missing (x) item" notification when I try to use it; just uses the "nothing" sound. It's still highlighted, but after finding the green keycard and going through about 5 zones looking for red orbs, it's the only thing I can think of at the moment lmao...

Even after resetting the game

It's possible to get into the section of the castle with the Ψ switch by ||jumping into the window from the scaffolding outside||. This was how I got in, after a few deaths. I proceeded to solve the puzzle there and light the Ψ... but the door back out doesn't open. I suppose this is authentic to some games of the era, but I'm pretty bummed at the prospect of restarting from scratch just for this. Am I meant to?...

very nice

I thought the game would have come out on PlayStation 1, and would have supported the old controllers with no analog sticks, so I made a controller mapping that puts the movement on the D-pad and bumpers, and the look up/down on the triggers, like King's Field. The analog sticks are totally disabled. If Figglewatts wanted to add a single option to the Controls menu to switch between analog and digital, that would be better, because it wouldn't break if you closed the pause menu with B rather than Start....