I had 3.
Nintendogs, Rayman and Super Monkey Ball 3D.
Out of those, Super Monkey Ball 3D is the only one I actually played for any considerable amount of time, and Nintendogs I traded in at GameStop to get something at a pretty hefty discount during one of their trade in deals. I forget what it was, but it was a while after the 3DS launch and it was a pretty nice discount, probably more than the game would sell for other places.
I only bought Rayman 3D because I looked up Rayman 2, which the game was a port of, and it seemed to be pretty well received, but honestly I played Rayman 3D for a few minutes and then never looked at it again. I should probably give it another go sometime.