Viking survival game Valheim has done some bloody numbers since it was released earlier this month. It soon became the fourth most played game on Steam, and just a few days ago developers Iron Gate Studios announced that it had already sold more than two million copies. At first glance, Valheim looks a bit like Viking Rust, and you might think this is where the inspiration comes from. According to co-founder of Iron Gate Studios, Henrik Törnqvist, it requires more influence from single-player action-adventure games and RPGs like The Legend Of Zelda and Skyrim.