F-Zero X Expansion Kit was an expansion to the original F-Zero X that was released exclusively on the Nintendo 64 through the Nintendo 64DD add-on. It was the first of a few expansion packs that were released on the service, with one for Doshin the Giant being released a month later. The game offered fans of F-Zero X new features such as a vehicle and track creator, as well as 12 new tracks made exclusively for the expansion kit. Other changes or additions were made as well, and all of the features, tracks and vehicles of the previous game could be accessed once again.