Must have PSP Games

What are Must have PSP Games ?

I got my PSP a week ago and right now i have

*Metal Slug Anthologie (lovin it)
*Daxter (didnt play it yet)
*Wipeout Pure (pretty fun but i suck at it)
*PoP Revalations (which is not so good compared to ps2 or PC versions because of technical issues)

*Lumines 1 or 2 (Your call.  They're both the same addictive puzzle game.)
*LocoRoco (A very, very odd game, with enough charm to make a hardened prison inmate smile.)
*Tekken: Dark Resurrection (Same old Tekken we know and love, but with two new characters introduced into the roster.)