pcsx2 supports disc swapping but monster rancher does it a bit differently and that confuses it i guess?? and the emulator just freezes unless you uncheck "automatic gamefix" after which it'll either summon a monster or get confused and be unable to read its own game disc (repeatedly prompting you to put monster rancher 4 back in the system, even if you have) i'm sure there's a way to fix that problem but hmmmmm i'm dumb :u