This open-world game is blowing up. Here’s why.

Valheim, an open-world viking survival game on Steam Early Access, is doing well. Really, really well. After launching on February 2, it hit a million sales in just eight days, before doubling that on Feb. 15. As of Feb. 20, Valheim had sold 3 million copies, and it doesn’t look like letting up any time soon.
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