Dezaemon DD, Nintendo 64 unreleased game
An expansion of Dezaemon 3D was planned for Nintendo 64DD but has been canceled.
Shoot 'em up
This expansion disk for Dezaemon 3D has never been published, despite the cartridge's menu has an item about a connection with the 64DD. A prototype would have been found around 2010 but nothing from its content has filtered on the Internet.