

Equipment like jetpacks, scanners, improved armor, stimulants and medical kits becomes available as the space marines accumulate experience points. Some low-level guns feature bayonets for mêlée combat, which form a substantial element of the game. Outside of missions, the main decision is which weapons and equipment to purchase to outfit the squad.

There are three difficulty levels which influence parameters like monster respawn and damage rates. The game has some head-to-head and co-op multiplayer support via LAN and software such as Kali. The single-player campaign includes around 30 missions set in futuristic interiors full of aliens, as a squad of space marines battles to save the civilians and themselves.
