around 2016 there was a website that had online multiplayer cat Mario but the levels were harder and really interesting. i cant find any info anywhere and the servers have been shut down. i wish I could find something about this game but no luck. does anyone have any knowledge on this?

Actually, what I only knew is that there’s a multiplayer version on iPad called Syobon Online, but I don’t know the version you said. Maybe Hyncnc does? :)