I set compatibility to Proton 9.0-03 and it works. Once in a while I see a bit of flickering in the cutscenes though.

Hi Catherine fans, We've worked hard to make Catherine Classic the best experience possible on PC, but the infinite variety of PC configurations means that sometimes bugs slip through our nets. If you experience any issues with Catherine Classic, please report them here IN THIS THREAD. Keeping everything in one place helps our QA team collate any frequently reported bugs. Please also report your PC configuration -- it helps us tremendously. Happy puzzling and...cheating? Edge! -SEGA Dev ...

Can anyone help me with the Babel levels in this game? i've heard and read that they're supposedly way easier to do in pairs with less steps and simpler block puzzles i did all of the stages in storyline on gold, i've been attempting to do Altar for like 3 hours straight and for the love of god i can't go past 130th step I don't have a controller Edit : I already managed to do this myself, all babel stages, even Axis Mundi. I havent had a single clue i could use the same keyboard to control the 2nd player ...

i tried everythhing! changing the compatibility, trying to execute on the folder as admin, trying to change steam settings, even things on the control Panel... I JUST WANT TO BE ABLE TO PLAYYYY... do someone know or found something that helped to play?...

It's just classic but with more of everything, I really hope Atlus ports it soon.