Gameplay involves navigating through the facility, using your flame thrower to blast aliens while avoiding harming innocent civilians. Be cautious, as prolonged stays in a room will summon an invulnerable green alien, forcing you to flee quickly. Alien contact depletes your energy, and if you run out, a crew member dies - time to switch to another operative.
Scattered throughout each room are valuable supplies, allowing you to stock up on ammo, grenades, or health when needed. The teleport feature lets you warp between floors or areas within the same floor using the blueprint reader, giving you flexibility in your approach.