Donkey Kong Plus (lost build of cancelled Game Boy Advance puzzle platformer; 2002)
Status: Lost
Mario vs Donkey Kong is a 2005 puzzle-platformer for the GameBoy Advance being a seuqel to the 1994 Donkey Kong for the original GameBoy.
It had an early version of the game under the name Donkey Kong Plus in 2002 that takes advantage of the GameCube and GameBoy link functionality.
History
Donkey Kong Plus was publicly shown at E3 2002 as a tech demo. Where it would utilize the GameBoy GameCube link cable feature for users to create levels on the GameCube and then send them to their GameBoy Advance to play them. Several years later the game would be refitted as Mario vs Donkey Kong while retaining the gameplay, and concepts, from it's early prototype, it would lack the level editor. However it's hidden and in order to access it you would have to edit the byte in the games code. It's Nintendo DS sequel Donkey Kong 2: March of the Minis for the Nintendo DS, would later include a level editor feature.
Avaliability
The only thing resurfacing from the tech demo are screenshots and videos but are in lower quality.