After the deal with Sony about producing a CD-ROM extension for the SNES fell through, Nintendo attempted to create its own extension for the Nintendo 64 utilizing magnetic discs. Dubbed the 64DD, many sought-after games were announced for this add-on: EarthBound 64, Ura Zelda, Fire Emblem 64, and Super Mario 64, as well as many others.
However, delays that pushed the release date from late 1997 all the way to December 1999 and a very limited availability once it was released pretty much set the 64DD's future as a commercial failure. The delays resulted in a number of the announced games being released in N64 cartridge form instead, while others were simply cancelled. In the end, just 10 disks were released for the 64DD.