What is your favorite PSP game?

Please share

That's pretty specific, I have to wonder if here happens to be anyone who's ever touched the device?

That said, there's always emulators.
...if you have hardware to run them. Mine is on the border, with few PSP games I can actually play.

And my favorite, ahem, I'll have to say *cough*Criminal Girls*cough*
Look, it's got a great battle system, one of the most interesting I've seen in any turn-based RPG (aside tactical RPGs and combat systems leaning that way).
And the way experience is shared with non-active characters solves the age old question of whether to stick to your best ones or train all equally.

I do wish I'll get to eventually play it in English, it'd be nice to really know the plot. Criminal Girls is possibly the biggest game that I've ever played in Japanese (or in general in language I don't understand).

I'm now playing Phantasy Star Portable and it pretty much is my new favorite (despite running awkwardly slow much of time).
Which isn't surprising as old Phantasy Stars are my second or third favorite game series ever - original Master System Phantasy Star being my first JRPG.

Phantasy Star Portable is related to Phantasy Star Universe, the sadly unsuccessful sequel to Phantasy Star Online games, before latest Phantasy Star Online 2 series.