As it stands, the 3DS has DS mode built in. As far as I can understand, this is comparable to the Wii mode on the Wii U, and it's the same reason why we quickly had DS homebrew on the 3DS using the already widely-known DS flash carts. I've seen at least one or two users on this forum suggest a 'DS Emulator' on the 3DS and initially wrote it off as being a rather dumb idea however I've sort of back-tracked and I'd ask people to consider the possibilities. SM64DS, as a use-case example. There's still a fairly (somewhat) active modding community for the game even though the controls are shoddy. The only method of getting analog input into DS games was via the touchscreen. In another scenario, modders have taken primarily touch-screen enabled games like Legend of Zelda: Phantom Hourglass and mapped button presses to touch-screen functions. In an emulator environment, or at least in an environment where we have full access to the 3DS circle pad, mapping the analog to the touch screen becomes a possibility. There's an opportunity to seriously improve the DS gaming experience, especially for a few of these titles like SM64DS, Rayman DS, Metroid Prime: Hunters, Animal Crossing DS, and so on. I'd love to hear from developers about what their take of the possibility of this happening would be. Would the 3DS necessarily need to 'emulate' the DS since it's very similar hardware? Can DS code be executed in 3DS mode? I'm not experienced, just wanted to open up discussion about the possibility and whether that would be feasible or not.