What Lurks Inside

What Lurks Inside is a semi-cooperative survival role-playing game set in a mysterious scientific facility. You can play alone or in multiplayer, which is recommended. As humans, you explore the facility, complete objectives and try to purge it; as the monster, you disguise yourself among them and sabotage their efforts.

The humans

Four bodies in environmental suits enter the facility, but only three are human. You cooperate with the other humans, if you can trust them, and use melee weapons and teamwork to complete objectives and purge the lab. Environmental dangers and random facility issues shape each playthrough.

The monster

As the monster, you use special Bio-Growths to fast-travel through the facility, set traps and plan ambushes several rooms ahead or lie in wait. You can pick off your companions one by one or attack them all at once, sabotage their equipment, and rip apart corpses to collect bits for feeding the Bio-Growth.