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Serious Sam: Siberian Mayhem

Serious Sam: Siberian Mayhem

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.

Released Jan 25, 2022 Developer Croteam, Timelock Studio Publisher Devolver Digital Platforms Windows Boomer ShooterActionAdventureShooterFirst-Person
View on Steam ↗ $19.99 (US · as of 2026-07-26)

What players say

Steam review score and the most-helpful voices, which may include critical ones. Data as of 2026-05-20.

92.6%positive4,452 reviews
Recommended · 4 found this helpful

“A very good expansion/DLC for a decent game. In my personal opinion, the original Serious Sam 4 is the weakest game in the main series (Encounters-3-4-SM, not mentioning 2 as it's basically the SSam equivalent of Flatout 3 / Postal 3, better left alone and forgotten), even if it…”

— a player, Steam review · 52 hrs played
Recommended · 1 found this helpful

“After SS4 my expectations were in the gutter, but I have to hand it to Croteam on this one - they really hit their stride with this expansion! In my review of SS4, I called the level design "haphazard". Things were just kind of... There. This set of levels are much more tightly…”

— a player, Steam review · 5 hrs played
Recommended · 0 found this helpful

“creo que si rusia no estuviera limitada por los conflictos politicos a dia de hoy tendrian varios de los mejores estudios de videojuegos del planeta”

— a player, Steam review · 11 hrs played
Read more reviews ↗

Player activity

Monthly average concurrent players. Live count fetched 2026-07-11 13:52 UTC · history via SteamCharts.

80playing at last check
7924-hour peak
1,505all-time peak
0 500 1k 2022 2023 2024 2025 2026 676 avg · Jan 2022

Achievement stats

Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-07-25.

51achievements
15.7%median completion
2.4%rarest: Hero
88.8% of players 73.4% of players 72.1% of players 67.9% of players 66.6% of players 65.4% of players 62.6% of players 61.7% of players 59.3% of players 58.7% of players 54.5% of players 51.4% of players 51.2% of players 50.1% of players 48.6% of players 44.7% of players 42.6% of players 39.1% of players 38.6% of players 37.2% of players 36.2% of players 32.1% of players 29.9% of players 23.2% of players 20.2% of players 15.7% of players 15.2% of players 12.2% of players 10.4% of players 9.5% of players 7.5% of players 7.4% of players 7.2% of players 6.6% of players 6.4% of players 6.4% of players 5.5% of players 5.2% of players 5.0% of players 5.0% of players 4.9% of players 4.7% of players 4.2% of players 4.2% of players 4.1% of players 4.0% of players 4.0% of players 3.8% of players 3.5% of players 3.1% of players 2.4% of players 88.8% 0% most earned rarest
Almost everyone has
88.8%Dogs and Frogs — Hidden achievement
73.4%The Refinery — Hidden achievement
72.1%Black Gold — Hidden achievement
Rarest badges of honor
2.4%Hero — Unlock all Achievements.
3.1%Massacre Party — Complete Siberian Mayhem on Serious difficulty in Cooperative with enemy multiplier set to at least x2
3.5%Combustion Tamer — Kill 30 enemies while riding one Draconian Burner

Price tracking

US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.

$19.99current · sampled 2026-07-26 08:39 UTC
$19.99lowest since tracking began2026-07-11
US19.99 USD
EU19.50 EUR
UK16.75 GBP
Australia29.50 AUD
Canada25.99 CAD
Japan2,300 JPY
Brazil59.99 BRL
China88.00 CNY

Regional prices at last sample, in local currency — Steam sets each region's price independently.

Brazil≈$12 China Japan Canada US Australia EU UK≈$22

Cheapest → most expensive, converted to USD at ECB reference rates (2026-07-24). Relative comparison only.

$0 $25 $50 07-11 07-13 07-16 07-19 07-22 07-26

Latest official news

Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.

Mar 26, 2026
Serious Sam is Back, Baby! Enter the Shatterverse

Hey folks, It's a massive day for everyone at Croteam and Devolver Digital because we get to announce a brand new partnership with Behaviour Interactive, who are working on the next installment of the

Dec 23, 2025
A Seriously Serious Christmas

From all of us at Croteam, we’d like to wish you a seriously Merry Christmas.May you enjoy the holidays with friends and loved ones, stay full of health, and welcome 2026 with joy, optimism, and a pos

Mar 10, 2023
Featured Mod - City Of The Pyramids

Hello and welcome to the new episode of Featured Mod! For the first time in our series, we will be featuring a campaign for Siberian Mayhem! Today’s mod is “City Of The Pyramids”- a one-level campaign

Jan 25, 2023
Anniversary Update 1.07

Hello, folks! Today is a very special day for all of us here at Timelock Studio, because exactly one year ago, Serious Sam: Siberian Mayhem hit the stores worldwide. You can say our brainchild has its

Dec 29, 2022
Hotfix 1.06c

Fixed an issue that caused increased player speed on NG++ and further to reset to normal speed after watching a cutscene; Fixed an issue that caused allied Draconian Burner’s AI to randomly break; Fix

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UNLOVED UNLOVED 76.4% · 1,229 reviews shares Boomer Shooter, Demons, Online Co Op, FPS Unreal Gold Unreal Gold 89.6% · 1,516 reviews shares Boomer Shooter, Old School, FPS, Co Op Final DOOM Final DOOM 84.4% · 821 reviews shares Boomer Shooter, Demons, Old School, FPS Bloodshed Bloodshed 83.0% · 1,048 reviews shares Boomer Shooter, Demons, Old School, FPS Quake Quake 96.3% · 11,408 reviews shares Boomer Shooter, Old School, FPS, Co Op Quake II Quake II 95.0% · 6,568 reviews shares Boomer Shooter, Old School, FPS, Co Op Serious Sam II Serious Sam II 87.7% · 4,066 reviews shares Boomer Shooter, Online Co Op, FPS, Co Op Serious Sam Classics: Revolution Serious Sam Classics: Revolution 87.5% · 1,411 reviews shares Boomer Shooter, Old School, FPS, Co Op

Screenshots

Official Steam store screenshots — click any shot to enlarge.

Facts & details

From the Steam store record, snapshot 2026-05-20.

GenresAction, Adventure
Player tagsBoomer Shooter · Action · Adventure · Shooter · First-Person · 3D · Dark · Atmospheric · Old School · Horror · Sci-fi · Combat (SteamSpy community voting)
FeaturesSingle-player · Multi-player · Co-op · Online Co-op · Steam Achievements · Full controller support · Steam Trading Cards · Steam Workshop
LanguagesEnglish * , French, Italian, German, Spanish - Spain, Japanese, Korean, Polish, Portuguese - Brazil, Russian, Simplified Chinese, Traditional Chinese, Turkish *
ControllerFull support
Achievements51
Estimated owners500,000 – 1,000,000 (SteamSpy)
Official sitehttp://www.serioussam.com
Minimum system requirements (PC)

Minimum: Requires a 64-bit processor and operating system OS: Windows 10 64-bit Processor: 4-core CPU @ 2.5 GHz Memory: 8 GB RAM Graphics: nVidia GeForce 780/970/1050 or AMD Radeon 7950/280/470 (3 GB VRAM) DirectX: Version 11 Storage: 25 GB available space Additional Notes: Requirements are based on 720p rendering resolution at 30 FPS