- Steam pricePrice
- $19.99
- Release
- January 25, 2022
- Session GoalsGoals
- Modes
- Platforms
How co-op works
Up to four players run the five-level campaign online, crossing open Siberian areas, side missions, and arena-scale fights against Mental’s hordes. New weapons, gadgets, and vehicles let teammates split crowd control, heavy-target damage, and exploration while the entire group advances the same route.
About this game
Serious Sam: Siberian Mayhem is a stand-alone expansion that throws players into the frozen wastes of Russia to face waves of Mental's monstrous army. This is true co-op chaos where every player fights together against relentless alien hordes in large-scale firefights that demand constant movement and trigger discipline.
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The core loop revolves around mowing down massive enemy waves with an arsenal of over-the-top weapons, dodging projectiles, and surviving absurd setups that fill the screen with explosions. Playing with friends transforms every encounter into hilarious pandemonium as coordinating fire, sharing ammo, and reviving teammates under pressure turns simple skirmishes into unforgettable moments of party-style mayhem.
Online co-op lets you bring friends into the campaign for synchronized carnage across multiple missions. Sessions become a test of reflexes and laughter as the game piles on enemy types faster than any single player could handle, rewarding groups that embrace the organized chaos and keep moving forward together.
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Frequently Asked Questions
Can I play the whole campaign with friends?
Yes, online co-op lets you play through the entire campaign with friends. Every mission supports synchronized co-op where you'll face those massive enemy waves together from start to finish.
Is this a DLC or can I play it without owning other Serious Sam games?
Siberian Mayhem is a stand-alone expansion, which means you don't need to own any other Serious Sam game to play it. You can jump straight into this frozen Russian adventure on its own.
Does co-op make the game easier or harder?
The game scales up enemy waves when playing co-op, throwing more aliens at your group than a solo player would face. It's designed for party-style chaos where coordinating fire and reviving teammates becomes essential, so expect organized mayhem rather than an easy ride.