PS0 has ad-hoc and online play of 1-4 players, I would link the official thread but I don't want to do that to seraphic's thread... I mean actually I'll do that but in return I'll also link seraphics thread.
The official PS0 thread:
http://www.vgchartz.com/forum/thread.php?id=92688&page=1
I'm Unamerica and you can too.
The Official Huge Monster Hunter Thread: