HOW LONG TO BEAT SERIOUS SAM: SIBERIAN MAYHEM?
Serious Sam: Siberian Mayhem by Croteam takes about 5 hours to beat the main story.
Time to Beat
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Serious Sam: Siberian Mayhem is a new stand-alone expansion to the world of the classic FPS series. Join the fight against Notorious Mental on a journey through the wild lands of Russia, and find your way through this lost chapter of Sam Stone's adventures.