Whats the best games for ad hoc multiplayer?

My friend just got a psp slim this month and we're looking for some good ad hoc capable games.

So far we played Tekken and Monster Hunter, both were really fun.

I was thinking Mortal kombat, Burnout, and Metal Gear Solid: PO would be good.

Monster Hunter Freedom 2, Killzone Liberation, Tekkan & Street Fighter ;)

There the only worthwhile ones out at the moment, if you use xlink you'll find monster hunter freedom 2 has a really big online community on it.

i know that the game had a poor rating in most of its reviews but Alien Syndrome is real fun ! i didn't play ad-hoc but i had a lot of fun playing the single player campain.

the gameplay reminds me diablo so it can only be only better ad-hoc