With friends or solo, you face an ever changing threat level.
Second Extinction Steam CD Key Big guns. Second Extinction is an online FPS with bite. In Second Extinction you take on hordes of mutated dinosaurs alone or with up to two friends. Early Access includes: 4 heroes, 10 weapons (with 5 upgrade tiers each) and 6 missions - plus some special side quests - across multiple regions of our big map.