In Extremis

In Extremis is a science-fiction First Person Shooter (FPS) in which you play as a crashed space pilot stranded aboard a derelict vessel. To escape, you must collect key cards and insert them into terminals. Valid cards will give you a code for the current level. That code will grant you access to lockers containing weapons and equipment. A second set of key cards opens up elevators, allowing you to travel to deeper into the ship’s 29 levels.