Not in any particular order...
- Sideswiped: Best racing game on the system, period. It even is a pretty solid contender against the PSP's actual Burnout games (although Legends is a lot of fun).
- Puzzle Quest: CotW: The PSP version is better (it doesn't have touch screen controls but the better visuals and sound quality are a plus in my book) but it's fucking Puzzle Quest.
- Castlevania: Dawn of Sorrow: Metroidvania-style Castlevania and like the second best Castlevania game in my book (Symphony of the Night being the first).
- Picross 3D: This shit stole way too many hours.
- Pokemon HG/SS: Meh, I mainly just liked it because of the amount of content it has over the other Pokemon games. Plus the original games were pretty much my childhood.