If you want to get nit-picky, Wolfenstein 3D's tech wasn't original either. It was based on their previous title, Catacombs 3D, which was itself based on the te

If you want to get nit-picky, Wolfenstein 3D's tech wasn't original either. It was based on their previous title, Catacombs 3D, which was itself based on the tech of another previous title called Hovercraft 3D.