The Nintendo eShop is five years old, so it's having a whopper of a sale.
The eShop is where you make all of your digital purchases for Nintendo games, apps and other things which only exist as ones and zeroes. From the 9th to the 23rd of January 2016 there will be a huge number of titles on 3DS and Wii U on sale, at up to half price.
You'll find a huge number of nostalgic titles for a heavily discounted price including Donkey Kong 64, Earthbound, F-Zero, Super Mario Bros. 3 and Kirby's Dream Land in the sale.
If you're looking for something a little newer, Child of Light is just €7.49 and Steamworld Dig just €4.49.
The full list of titles is over on Nintendo's site and be sure to check out the deals from the 9th of June, 2016.