Nice Puzzle Games For PSP

I'm on holiday break and so I don't want my brain to turn to mush I'll be playing Puzzle games like Layton and etc for The ds. I was wondering if there were any nice puzzle or puzzle-esque games for the psp. Thanks in advance.

My favourite is Puzzle Quest.

Second that^Luxor and Pipe Mania are good as well.

Isn't Lumines a puzzle game?

Crush is a puzzle game, in a way.

Scrabble Classic.