R.U. Game? - Conker's Bad Fur Day - N64 - USED: The game once known as Twelve Tales: Conker 64 has undergone several changes throughout its development cycle. Rare initially designed the game to be an adorable 3D platformer in the mold of Banjo-Kazooie. Then, in May 2000, the company revealed that the game had taken a decidedly different turn. The previously harmless game, renamed Conker's Bad Fur Day, would now carry a "Mature" rating by the ESRB.