From my understanding, only 3DS eshop games will work but not GBA/DS games since that kicks you back into DS mode. But how can I be sure if a game runs in 3DS mode or GBA/DS mode? Here are some of the games I'm interested in: Phoenix Wright Dual Destinies: 3DS mode (Does the DLC download and work?) Cave Story (2d version): I see it listed under 3DS Downloads and DSiWare. So would the 3DS Downloads version run in 3DS mode? Shantae: this old GBC game is listed under 3DS Downloads with no DSiWare listing. 3DS mode? Shantae: Risky's Revenge: it's listed as DSiWare but the product page shows that it's available from both the Nintendo 3DS (Nintendo eShop) and Nintendo DSi (DSi Shop). No idea.