Undead Knights
Oh what, this game? Yeah, this game is crazy addicting and fun. You play as a kick ass necromancer who makes zombies out of enemy soldiers then use the zombies to do your bidding. PSN store has a demo that you can download on your psp and it's just great. Granted it does get repetive, but the metal tracks in it and bringing about zombies is great.
It's a hack & slash game, so if you're into those, I suggest checking this out. I loved making a bridge out of zombies to get across areas.