Here are my complaints about the free stuff (the Turtlekid Maneuver):
There is no way to make these games look good on the 3DS screen. The two options are full-screen, which is a total washed-out blur-fest similar to viewing SD stuff on an HD TV, or native resolution, which due to the 3DS's higher pixel density shrinks the viewing area into the size of a postage stamp and makes even a Game Boy Micro screen look like a JumboTron. It's like watching someone play GBA five rows ahead of you on a bus.
Secondly, Kirby & The Amazing Mirror? Really? That's a 4-player game. It's Kirby's Four Swords. Multiplayer is its entire raison d'ĂȘtre. But there's no programming to allow a 3DS to connect to multiplayer. It wants a GBA Link Cable.