Nintendo has an ongoing promotion where new Nintendo 3DS XL buyers can get one Nintendo recommended game as a free download. In September, Dragon Quest X will join the list the same day it launches. If you download Dragon Quest X you’ll also get a code to play online for 60 days.
Attack on Titan from Spike Chunsoft is on the list too along with Mario Kart 7, Luigi’s Mansion 2, and Tomodachi Life.