Diddy Kong
"Diddy Kong Pilot" was a planned sequel to "Diddy Kong Racing", but with flying as the only means of transportation. After Rare was sold to Microsoft, which caused the company to lose the rights to the "Donkey Kong" characters, "Diddy Kong Pilot" was converted into the game "Banjo-Pilot" in 2005. However, on November 5, 2011, a collector who had purchased a prototype cartridge leaked its ROM onto the internet.