2. Nintendo PlayStation

Yes, you read that correctly. Although heavyweight rivals in the modern gaming world, Nintendo and Sony once formed an unlikely alliance. The Nintendo Playstation was the product of this relationship, a project that started in 1998 after Sony engineer Ken Kitaragi became intrigued by his daughter’s Nintendo Famicom console. The Nintendo Playstation project was designed to play CD-ROMS as well as the cartridge format, but licensing disagreements caused the relationship to fall apart – and the console to be lost in time.