PATAPON!!!! Do EET NOW!
Final Fantasy Tactics is always fun and the battles are great for short bursts.
Metal Gear Solid Portable Ops is fantastic ^^
A Gran Theft Auto game is always good in a pinch.
Worms, pretty much any iteration of it is great with multi-player.
Wipeout (whichever the ones on PSP ) support multi-player I believe, and they're usually great games :)
I can name you dozens of other great games, but I'm not much of a multi-player gamer when it comes to handhelds xD so I can't help you out much.
From 0 to KICKASS in .stupid seconds.







