This was surprisingly easy to do! All you need is an internet connection or SD card. I used the Wii EULA exploit and it was very straightforward. It's important to note that this is completely legal, and all of the games shown are games I own. USB Loader GX allows you to play your games without having the disc inserted. I brought my Wii on a weekend trip with friends and it was great not having to bring a million discs.
