Seconding The World Ends With You! It's one of my fave ever games.
Scribblenauts is my favourite puzzle game, where basically you have to solve the puzzle or traverse the landscape using items you write in (there's an insanely huge database, so you can use anything from "rope" and "gun" to "Cthulu" and "Large Hadron Collider".)
The Legend of Zelda: Phantom Hourglass isn't the best Zelda game I've ever played, but it's still a pretty freaking awesome game. Requires no knowledge of the series or universe. There's an RPG element, but lots of puzzles to solve along the way, and it makes really good use of the DS stylus screen, imho (like, you can draw on the map! and mark important points!)
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Scribblenauts is my favourite puzzle game, where basically you have to solve the puzzle or traverse the landscape using items you write in (there's an insanely huge database, so you can use anything from "rope" and "gun" to "Cthulu" and "Large Hadron Collider".)
The Legend of Zelda: Phantom Hourglass isn't the best Zelda game I've ever played, but it's still a pretty freaking awesome game. Requires no knowledge of the series or universe. There's an RPG element, but lots of puzzles to solve along the way, and it makes really good use of the DS stylus screen, imho (like, you can draw on the map! and mark important points!)