This is my first thread so please don't criticise.
What if the 3DS had it's own account system? Like, let's say you and your friend have a 3DS. You lost yours and you want to play on your friend's. But he doesn't have a specific downloaded game you want to play, and you have that game on 3DS. Well just login into your account and you can play the game.
Do you like the idea?
