Fly around the interiors of mines, refineries, research centres, and other industro-technical environments with full six degrees of freedom control: roll, tilt, yaw, and slide in all directions. Battle with your friends in pitch-black tunnels in the multiplayer action, or take on robots infected with a terrible nanovirus plague in the singleplayer campaign.
Doom 3 patch 1.3.1 is required to play IC003a