List of Donkey Kong 64 pre-release and unused content
This is a list of pre-release and unused content for the game Donkey Kong 64.
Not For Resale demo cartridge
A demo cartridge was produced to exhibit the game in retail stores. It contains the second Dogadon fight, the Mine Cart-riding sequence in Jungle Japes and a boss fight with Army Dillo. This demo features a few differences from the final build .
Text and interface
Stop 'N' Swop
As with Banjo-Kazooie and four other unspecified Rareware-developed games Donkey Kong 64 had a planned "Stop 'N' Swop" function that allowed players to unlock exclusive in-game content by quickly swapping two compatible game cartridges while the Nintendo 64 system's power was on. The feature was scrapped after testing done by Nintendo Research & Development 3 in collaboration with Nintendo's Uji production facility revealed that not all revisions of the console would hold the data in the RDRAM long enough for it to be viable, as well as there being a risk of damage done to both the system and the cartridge. Nintendo of America's tech support proposed Chris Stamper an alternative way to implement Stop 'N' Swop unlockables, involving a secret passcode in Donkey Kong 64 that could be used in Banjo-Kazooie to open a locked area, followed by the player answering a question correctly in Donkey Kong 64 in order to produce an Ice Key; however, this idea did not materialize.
It is possible the "Ice Key" line of text encountered via cheat codes is a remnant of the Stop 'N' Swop feature.
Unused bonus levels