I've lost my 3DS, so I can't confirm its functionality or initialize it. m(。>__<。)m I used Mario Kart 7 about a year ago, and it worked fine! I'm not sure about the DS, but I think the 3DS games should mostly work. None of the games have cases. 3DS Cartridges: Yo-kai Watch Blasters: White Dog Squad Mario Kart 7 Super Mario 3D Land Metal Gear Solid 3: Snake Eater 3D Luigi's Mansion: Dark Moon DS Cartridges: New Super Mario Bros. Dragon Quest IX: Sentinels of the Starry Skies Penguin's Problem: The Strongest Penguin Legend Mario & Sonic at the Olympic Winter Games Vancouver