Square Enix is promoting Kingdom Hearts 3D Dream Drop Distance through a present campaign. You're going to have to do a bit of work to put your name down for the drawing, though.
Visit the Kingdom Hearts Dream or Drop campaign site to take a quiz challenge that tests your series' knowledge. Score high enough, and you'll be able to put your name down for a 3DS, a Kingdom Hearts 10th anniversary box, or a Dream Eater plush.
The campaign site will also host commercials at some point.