So I was just recalibrating my PS2 controllers in Duckstation right? Setting up which controller is in slot 1 or slot 2 for players 1 and two respectively.
Well, it turns out last night, for whatever reason, my Twin PS2 USB Controller Adapter tweaked out a little and set my first controller to the second while I was irritatingly trying to control the game.
To my surprise, I accidentally found more things relating to the game's existing debug menu that I could safely say nobody has ever seen before.
A green box to the right of the screen pops up, as well as the red dots and cheese icon.
Using the second controller, you can do stuff like toggle the region mode from PAL to NTSC (D-Pad Up or Down respectively), scroll through ECD entries (D-Pad left & right), toggle stuff like freeze gameplay (X button), no-clipping through doors and onto high platforms (Triangle, also toggles the debug display), L1 and R1 replenish health and give all weapons in the game (including ones that only specific characters can obtain) as well as all the colored keys, L2 toggles the HUD on or off, R2 seems to do something with your XY coordinates snapping you in place to a part of a room, and so on.
Don't know which debug menu needs to be activated to control the hidden part of it with the second controller, but I can provide the password codes below.
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Go into the Load menu from the main menu, then enter password:
Debug Mode 1
R#B@@T**************
Debug Mode 2
TW#@KNM#************
Sound Test 1 (Contains other things unrelated to sound)
H*BR*D#L*V*L#2**#69@
Sound Test 2
@*SNDTST*@@********@
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