What is the most addictive DS game you ever played?!

Absoloutely any of the main pokemon games (hg/ss/fr/lg...etc) will keep me addicted for agggggggges.
Chinatown wars had me for quite a while to, as did JUMP!US

It would have to be a tie between Advance Wars: Dual Strike and Dragon Quest 5.

I would have to say Planet Puzzle League I can't put it down once I get started.

Phantasy Star 0 was one of the few games that got me playing more than 2 hours in a row. I haven't played that much Ds for a long time XD

Taiko no Tatsujin DS Touch de Dokodon ;D
One of my favorite DS Games

Megaman StarForce 1,2&3
I finished them all within two weeks, I love those games

When I first played the Pokémon Mystery Dungeon games I got completely addicted.
Mario Kart too, although it can get annoying after a while.Other than that, I was addicted to Pirates of the Caribbean Dead Man's Chest for a short while (ie. until I completed it XD).