www.romulation.net is where you can go to download DS games plus gamecube, playstation etc... Just to be safe with the language make sure you downlaod the games marked by your countrtries flag. United states flag etc.. there is no cost. I've only downloaded two games. Lego guitar hero and the grapohics and songs are amazing, my kids love it. Good luck! I'm just now learning all about the R4i cards just since christmas. Good luck!