I was searching the internet, and I haven't really seen anyone else try this. What if (Just an example) you auto launched the nes emulator (I think its NesDS) then auto launched the nes game you wanted. Then you could have Super Mario Bros. as a physical copy for the ds/3ds. Maybe doing it through the nes emulator is a bad idea, maybe there is something that does it already, I don't know, I couldn't find it. I just thought it would be cool.