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Def. I got tired of wasting bullets so I just unequipped my gun before leveling. lol

Yeah, so plug in your PS4 or PS5 with a USB cable. Your machine should ding with a drive installation the first time you do. Install and run Joy2Key and it's easy to check if its working just by pressing the buttons on the controller. On Joy2Key, a button press will cause the corresponding input to light up yellow.  Then just use the keyboard and controller info-graphics to translate the mapping in Joy2Key. You can even do some custom mapping. It's super useful for making old emulators talk to my fight-sticks for arcade games.

You can run it through steam and steam will deal with the controller issue or you can run JoyToKey (free software that lets you pin keyboard inputs to your controller). I used JoyToKey for the whole game and it worked great.

You need to go to quick items, same way you equip blood vials, select the key ring, select the clinic key, then go to the door and interact with it while the clinic key is in your quick item slot.  I think it's a reference to the way that keys work in King's Field.

My PS4 Controller wouldn't work, but I used Joy2Key to have it interpreted as a keyboard and it works great. You can probably do the same thing with your PS2 controller and Joy2Key is free.