The First Descendant, whose open cross-play beta is currently enjoying a healthy spot on Steam's most played games list. At the time of this writing, The First Descendant has over 77,591 concurrent players, and that figure continues to rise. It's easy to imagine it landing into the top 10 by the end of the day.

So what is it? Well, The First Descendant is a free-to-play, sci-fi, third-person, co-op shooter that takes place in a post-apocalyptic world. But instead of one where rogue machines destroyed human civilization, you fight off monsters to ensure the survival of humanity's remains following an alien attack.

The First Descendant is developed by Nexon (Korea's Tencent, basically). The beta is live until September 25, but the full game doesn't have a release date. Even in these busy weeks for major video game releases, the game already has a sizeable audience. Obviously, it remains to be seen whether it can bring all those players back at launch.

Steam Page