Just go to Nintendo eShop on your Nintendo 3DS or 2DS from Thursday, Jan. 30, at 9 AM (PST) until Sunday, Feb. 2, at 11:59 PM (PST) to download this awesome adventure. Grab it while you can: when the offer ends, it might be a while before you see the game again in Nintendo eShop.
I didnt see it on my console so its probably only US…keep an eye our or tell your overseas mates.
Dammit I want Four Swords. My kids both have it (I passed my original 3DS and all of its games onto my son and he handed his onto his sister) and when I eventually bought an XL I realized immediately that I couldn't get Four Swords again!