What's your favourite/favorite DS game?

I did the courtesy of spelling it the American and English spelling, but now you have to vote for your favo/urite DS game. Not the best DS game, but your favo/urite game. I've chosen a few that people may like,but it would be nice to see a few posts about why you like it. I couldn't fit AC:WW in, but you can always choose other.

For me, it's Advance Wars. Best.Turn-Based.Game.Ever.

Animal Crossing WW and New super Smash bros.

That's a hard one to decide ! It's a toss up between NSMB and Mario Kart.

Hunters for me, although I really do enjoy some RE action alot also.