Which was your favorite PSP game?

I exclusively played my PSP from grade school to high school. That thing never left my hands through those years. My favorite game on the PSP was Naruto Ultimate Ninja Heroes 2. That part where you go up the tower, clearing rooms and shit, those were enjoyable to me. I probably finished the whole game three times until I got bored. How about you? I am expecting a Need For Speed Most Wanted answer lol.