BattleBots (Unreleased Gamecube/PS2 Game; 2003)
|The US cover art for BattleBots. Note the ESRB rating and Nintendo Seal of Quality, suggesting that the game was almost finished.|
BattleBots was a video game that was based on the television show BattleBots, a robot combat game show. It was supposed to be released for the GameCube and PlayStation 2 by THQ but was cancelled, possibly due to the cancellation of the original show. It appears that the game was almost finished, as gameplay footage can be found online and the US version of the cover art had an ESRB rating and the Nintendo Seal of Quality. The game would have had 40 robots (both real and fictional) and 20 arenas.
The game was first announced on the official BattleBots website on September 12, 2002, with a possible release in November 2002. However, the game was then postponed until early February 2003, before being delayed once again to May 2003. After that, there was no more mention of the game on the website.
Prototypes of BattleBots do exist, however. They all sold out on the official website for $150. In May 2015, Team Nightmare Combat Robots were actually able to play the GameCube version. A screenshot exists of the aftermath, where hotel security caught them playing it on the hotel lobby's television. The actual prototype has not yet been uploaded as a ROM to the internet, however.
UPDATE 26/5/2016: The BattleBots website actually did sell a prototype copy on their website for $299.98. However, the copy has been sold, so the only current hope, for now, is that the buyer of the prototype uploads it to the internet as a ROM.