3ds is one of the easiest machines to hack. Takes 15 minutes to 2 hours, depending on what firmware it is running, but the modding community is pretty big right now for it. There is hShop (replicates eShop but everything is free and you can download homebrew and custom stuff there aswell), CTGP 7 is a mod to mk7 which adds lots of new levels, online play, game modes, items and character skins. Lots of other cool things aswell, those were just at the top of my head
3ds is one of the easiest machines to hack. Takes 15 minutes to 2 hours, depending on what firmware it is running, but the modding community is pretty big right now for it. There is hShop (replicates eShop but everything is free and you can download homebrew and custom stuff there aswell), CTGP 7 is a mod to mk7 which adds lots of new levels, online play, game modes, items and character skins. Lots of other cool things aswell, those were just at the top of my head