Nintendo 64DD

From The Super Mario 64 DS Wiki

The Nintendo 64DD (Nintendo 64 Disk Drive) was a device released only in Japan, due to commercial failure. It

was attached to the bottom of a regular Nintendo 64. What it did was allow you to play games in a disc format. Several Mario games were released for the system, being from the Mario Artist series. Only 9 games ended up being released for the system, along with several peripherals

Games
Only a few games were released:
 * Mario Artist: Communication Kit
 * Mario Artist: Talent Studio
 * Mario Artist: Paint Studio
 * Mario Artist: Polygon Studio
 * Sim City 64
 * F-Zero X Expansion Kit
 * Doshin the Giant
 * Doshin the Giant 2
 * Japan Pro Golf Tournament

Cancelled Games
﻿Here are a few of the cancelled games that were supposed to be released on the 64DD:
 * Mario Artist: Game Maker
 * Mario Artist: Graphical Message Maker
 * Mario Artist: Sound Maker
 * Mario Artist: Video Jockey Maker
 * Super Mario 64 2
 * Super Mario RPG 2 (Paper Mario in USA)
 * Donkey Kong World
 * Ultra Donkey Kong (Donkey Kong 64)
 * Ura Zelda (Became GameCube title The Legend of Zelda: Ocarina of Time Master Quest, released in a bonus disc)
 * Zelda Gaiden (Released in a cartridge as Majora's Mask)
 * EarthBound 64 (Became Japan Only GBA title, Mother 3)
 * Banjo Kazooie 2 (Became Banjo Tooie, released in cartridge)