As part of Zelda’s 25th Anniversary Nintendo promised to release The Legend Of Zelda Four Swords Adventures for FREE on the DSi/DSi XL and the 3Ds for a limited time.
This is not the GameCube version, instead its the GameBoy Advance version with updated Wireless Play. So if you know someone else who has a DSi/DSi XL or the 3Ds you can invite them to join your quest in saving Hyrule or if not you can play it alone.
To download this on the 3Ds just go to the eShop and it will be the newest release or press on the Zelda 25th Anniversary logo and select Zelda Four Swords Adventures Anniversary Edition then download. If you have a DSi or DSi XL go to the DSi Shop and follow the same procedure above. Please note you must have the latest firmware on the 3Ds or the DSi/DSi XL to get it.