Looking for some great iPod app games...?

I've recently gotten into Plants vs. Zombies. Some of my other favorites are Doodle God, Logic Box, Words with Friends, Fit It!, etc. Nothing too gory, etc. I like puzzle/mystery games, too, like Professor Layton and Phoenix Wright on the DS. I'm particularly looking for games I might want to play on a loooooooong road trip my family is going on in about a month. Thanks!!