Conker's Bad Fur Day, Nintendo 64 unreleased game
Conker's Bad Fur Day is a 3D adventure game completely irreverent released by the end of Nintendo 64's lifespan.
Conker's Twelve Tales
The game has become much more irreverent than planned and then renamed Conker's Bad Fur Day for its release. There are a lot of differences between the final products and the original design.