MadSpace

Humanity is in an intergalactic war with hostile aliens. You command a ship that, after a space battle, boards the alien mothership. Inside, you can fly or walk through the MadSpace where the laws of physics at times don't apply. There are some pre-rendered interactive sections and cutscenes viewable in Stereo3D. There are 25 levels plus secret areas, with 16 enemy types and 11 extraterrestrial weapons. Up to 16 players can play over a network or through a modem. It also uses speech recognition in gameplay.