Locked areas require a color-coded (blue or red) pass card to be opened, which are granted by interacting with computer terminals. There are two ammo types for human firearms and alien firearms. Health is also available in rooms called 'health chambers', where the player can obtain up to 100 hit points.

Ammunition and health are not scattered around the levels as objects to pick up, but rather as dispenser bays encased in the level walls. Infrared is employed to detect invisible traps, while night vision enhances the player's vision in dark areas of the game. The player is equipped with a visor capable of both infrared and night vision. The map can be expanded by finding the floor plan. The player can activate the proximity map in one corner of the screen, showing a small section of the current level with active aliens marked in yellow. In the CD version, there is a fifth setting, which randomly scatters items and enemies throughout the game. There are four difficulty settings, which modify the number of enemies that need to be eliminated and how much damage the player will take from enemy attacks and traps. The player is tasked with killing a certain number of enemies before the exit to the next floor is accessible. Corridor 7 consists of 30 floors (with 40 floors in the CD version) and 6 bonus floors.

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