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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.
In short, Steam reviewers most often praise “fast-paced gunplay with varied encounters” (38 of 72 reviews) and “atmospheric Russian setting with varied environments” (8); the most common complaint is “short campaign length” (8). What reviewers agree on ↓
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-29 · quoted reviews as of 2026-05-12.
What reviewers agree on
38 of the 72 reviews raise this.
“Way more enjoyable than Serious Sam 4.”
8 of the 72 reviews raise this.
“Nicely made atmospehre and landscape with typically cool jokes. Adjusted wepons and items are awesome!”
“A beautiful sequel ruined by horrible optimization. I loved this game. I loved every minute of it. It was a beautiul shooter experience. Serious Sam is definitely one of my favorite franchises ever. I've played it's…”
6 of the 72 reviews raise this.
“Loved the book references”
“Nicely made atmospehre and landscape with typically cool jokes. Adjusted wepons and items are awesome!”
“This is just as good as SS4, or even better? It's actually a "mid-quel" since it takes place before the final battle of SS4. I believe the most notable part of this game is that it has a tragic ending, that's a first…”
3 of the 72 reviews raise this.
“Madness while fought the horde...,challenging!”
3 of the 72 reviews raise this.
8 of the 72 reviews raise this · 8 of them still recommend the game.
“A beautiful sequel ruined by horrible optimization. I loved this game. I loved every minute of it. It was a beautiul shooter experience. Serious Sam is definitely one of my favorite franchises ever. I've played it's…”
6 of the 72 reviews raise this · 5 of them still recommend the game.
“This is just as good as SS4, or even better? It's actually a "mid-quel" since it takes place before the final battle of SS4. I believe the most notable part of this game is that it has a tragic ending, that's a first…”
“Feels like a janky mod with extremely bad writing and self insert characters, there were some fun parts but for this price? Not worth it.”
5 of the 72 reviews raise this · 3 of them still recommend the game.
“Graphics hardware not detected. As long as the game is unoptimized and devs do not fix, I cannot recommend”
“bad fps but Sam 4 runned perfect with same graphics”
“I don't know what in the world people meant by calling this one of the best when this game, even in its lowest graphics, cannot go beyond 80FPS on my PC. The graphics are not even justified for this, there are…”
3 of the 72 reviews raise this · 1 of them still recommend the game.
“It's a waste of money, and the Sam in this one is Lame!!”
“Feels like a janky mod with extremely bad writing and self insert characters, there were some fun parts but for this price? Not worth it.”
Counted across 72 English reviews, sampled to match this game's 92.2% positive rating · as of 2026-05-12
“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“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“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 playedPlayer activity
Monthly average concurrent players. Live data self-collected from the Steam API · history through 2026-06 via SteamCharts.
Achievement stats
Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-10-22.
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.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-10-22). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-12.
| Genres | Action, Adventure |
| Player tags | Boomer Shooter · Action · Adventure · Shooter · First-Person · 3D · Dark · Atmospheric · Old School · Horror · Sci-fi · Combat (SteamSpy community voting) |
| Features | Single-player · Multi-player · Co-op · Online Co-op · Steam Achievements · Full controller support · Steam Trading Cards · Steam Workshop |
| Languages | English * , French, Italian, German, Spanish - Spain, Japanese, Korean, Polish, Portuguese - Brazil, Russian, Simplified Chinese, Traditional Chinese, Turkish * |
| Controller | Full support |
| Achievements | 51 |
| Official site | http://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