Is Serious Sam: Siberian Mayhem co-op?

Yes, Serious Sam: Siberian Mayhem supports co-op.

Does Serious Sam: Siberian Mayhem have PvP?

Steam does not list PvP for Serious Sam: Siberian Mayhem.

Do we both need to own Serious Sam: Siberian Mayhem to play together?

Yes. Serious Sam: Siberian Mayhem is played online, so each player needs their own copy on their own Steam account (or PC Game Pass where it is offered). Steam Families can share a library, but two people cannot play the same shared game at the same time.

How many people play Serious Sam: Siberian Mayhem?

About 29 players were in-game when this page's data was last refreshed (2026-09-09).

Ready Up — what game do we play?Compare two Steam libraries →

Multiplayer games › Shooter › Classic & campaign shooter

Is Serious Sam: Siberian Mayhem multiplayer or co-op?

Yes — co-op. Serious Sam: Siberian Mayhem is a classic & campaign shooter game released in 2022, 93% positive on Steam (4,452 reviews), with 29 playing right now. $5.99 on Steam.

Co-opSingle-player tooShooter · Classic & campaign shooter

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…

How Serious Sam: Siberian Mayhem plays with friends, according to Steam

Online co-op: Yes
Local / split-screen co-op: Not listed on Steam
Online PvP: Not listed on Steam
LAN play: Not listed on Steam
Single-player mode: Yes
Controller: Full controller support
Mods: Steam Workshop

Steam's own category list for the game, as of 2026-09-09. "Not listed" means the store page does not claim that mode; community mods or Remote Play can still add it.

Steam tags: Boomer Shooter, Action, Adventure, Shooter, First-Person, 3D, Dark, Atmospheric

Do you and a friend both own Serious Sam: Siberian Mayhem?

Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Serious Sam: Siberian Mayhem is one of them — then helps you pick tonight's game with a weighted roll or a bracket.

Or open the Steam store page.

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Tired of Serious Sam: Siberian Mayhem? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.

Quick answers

Is Serious Sam: Siberian Mayhem co-op?: Yes, Serious Sam: Siberian Mayhem supports co-op.
Does Serious Sam: Siberian Mayhem have PvP?: Steam does not list PvP for Serious Sam: Siberian Mayhem.
Do we both need to own Serious Sam: Siberian Mayhem to play together?: Yes. Serious Sam: Siberian Mayhem is played online, so each player needs their own copy on their own Steam account (or PC Game Pass where it is offered). Steam Families can share a library, but two people cannot play the same shared game at the same time.
How many people play Serious Sam: Siberian Mayhem?: About 29 players were in-game when this page's data was last refreshed (2026-09-09).

Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; page updated 2026-09-23. Powered by Steam — not affiliated with or endorsed by Valve Corporation or Microsoft. Ready Up is a Somebody Decide program. How the data works · Legal & privacy · All types · Game Pass