The Skills 2.0 update introduced Risk of Rain 2 challenges which unlock new skills and skins for Survivors (at least on PC - they're coming to consoles this winter). Each Survivor has two to four challenges, and each challenge unlocks a skill augment or an alternate skin. The Risk of Rain 2 challenges vary greatly in difficulty and complexity, so we've put together a guide showing all the available challenges and how to complete them. If you need help getting new Survivors, check out our Risk of Rain 2 character unlock guide...
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