Although Ark: Survival Evolved is still in Steam Early Access, it has managed to sell over one million copies.
The open-world survival dinosaur game released on Early Access only a month ago and has enjoyed unexpected success, making $10 million in it's first week. Maybe releasing it close to Jurassic World helped a bit?
Ark: Survival Evolved is currently only available for PC, but is slated to hit PS4 and Xbox One at some point in the future.