The Denpa Men: They Came By Wave
is a new dungeon RPG by Genius Sonority, in which you use augmented reality-type exploration to find little guys in the environment, who then form your party. It's cute, quirky, and available on the 3DS eShop today. There's a demo if you'd like to try it out.
Also out on 3DS is Konami's Quarth
, a fascinating Game Boy puzzle game that never seemed to pick up a large audience in America.