Serious Sam: Siberian Mayhem — cheap CD keys, compare prices
Is it worth buying?
- Reviews are excellent. (Metacritic 70 · Steam 92%)
- The price is above its low (was €4.87), but within a reasonable range. Notify me on a drop →
Estimate based on public reviews (Metacritic/Steam) and price history — the final call is yours.
About the game
A standalone expansion of the classic FPS series that takes Sam Stone through the wild lands of Russia. You fight the forces of Notorious Mental in a lost chapter of his adventures. Developed by Croteam together with Timelock Studio.
Did you know?
Siberian Mayhem was made through a collaboration between Croteam and Timelock Studio, formed from Serious Sam community modders, and runs on the same Serious Engine as Serious Sam 4.
Best price today
€5.74
all-time low: official €4.87 · keyshop €5.72 (+18%)
On Steam: €19.50 — you save 71% here
The cheapest Serious Sam: Siberian Mayhem key right now costs €5.74 at K4G — the best of 16 compared offers. The lowest price we have recorded for this game: €4.87. The cheapest official store price is €9.99 at Fanatical. — the best offer is €4.25 (43%) cheaper.
The average low over the past 5 months was €5.25.
↳ chosen by the region label on the key — not a guarantee
Prices as of
GameSeal Marketplace
GameSeal Marketplace
Driffle Marketplace
Kinguin Marketplace
G2A Marketplace
Fanatical Official store
G2A Marketplace
Gog Official store
Steam Official store
No offers match these filters — try widening them.
Listed seller price shown — payment fees may vary by method.
Serious Sam: Siberian Mayhem prices by store 11
| Store | Type | Price |
|---|---|---|
| K4G | Marketplace | €5.74 |
| Driffle | Marketplace | €5.88 |
| Instant Gaming | Marketplace | €5.99 |
| Gamivo | Marketplace | €6.01 |
| Kinguin | Marketplace | €6.04 |
| Loaded | Marketplace | €6.09 |
| GameSeal | Marketplace | €6.21 |
| G2A | Marketplace | €8.27 |
| Fanatical | Official store | €9.99 |
| Gog | Official store | €17.81 |
| Steam | Official store | €19.50 |
Lowest — official stores
€4.87
Oct 2026
Lowest — keyshops
€5.73
Oct 2026
Price history
last 86 daysMonthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €4.87 | €5.73 |
| Sept 2026 | €5.85 | €5.74 |
| Aug 2026 | €9.99 | €5.89 |
| Jul 2026 | €4.87 | €5.72 |
| Jun 2026 | €4.87 | — |
Lowest in-stock price per month from our price history; the current month is the low so far.
How to activate your key
- Steam key — open the Steam client → Games → Activate a Product on Steam → enter the key. Stores with this activation: K4G, Driffle, Instant Gaming, Gamivo, Kinguin, Loaded, GameSeal, G2A, Fanatical, Steam
- GOG key — on GOG.com → Redeem a code (or in GOG Galaxy: Add games & friends → Redeem GOG code). Stores with this activation: Gog
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All-time low so far: €4.87
System requirements
| Minimum | Recommended | |
|---|---|---|
| OS | Windows 10 64-bit | Windows 10 64-bit (1909) |
| Processor | 4-core CPU @ 2.5 GHz | 8-core CPU @ 3.3 GHz |
| Memory | 8 GB RAM | 16 GB RAM |
| Graphics | nVidia GeForce 780/970/1050 or AMD Radeon 7950/280/470 (3 GB VRAM) | nVidia GeForce 1080/2060 or AMD Radeon Vega64/5700 (8 GB VRAM) |
| DirectX | Version 11 | Version 11 |
| Storage | 25 GB available space | 25 GB available space |
Similar games
Video reviews
14:30 Serious Sam Siberian Mayhem Review - In Progress (Seriously Fun?)
ACG
22:41 Serious Sam: Siberian Mayhem is Seriously Good
GmanLives
10:28 Serious Sam: Siberian Mayhem for PC Video Review
Gaming Pastime
Reviews are made and published by independent YouTube channels; they load only on click.
About this game — FAQ
Does Serious Sam: Siberian Mayhem have co-op?
Yes, Serious Sam: Siberian Mayhem supports online co-op.
Does Serious Sam: Siberian Mayhem have multiplayer?
Yes, Serious Sam: Siberian Mayhem has multiplayer.
Can Serious Sam: Siberian Mayhem be played single-player?
Yes, besides multiplayer modes, Serious Sam: Siberian Mayhem can also be played solo (single-player).
Does Serious Sam: Siberian Mayhem support a controller/gamepad?
Yes, Serious Sam: Siberian Mayhem has full controller support.
What languages does Serious Sam: Siberian Mayhem support?
Serious Sam: Siberian Mayhem is available in: English, French, Italian, German, Spanish - Spain, Japanese, Korean, Polish and 5 more.
Does Serious Sam: Siberian Mayhem use Steam Cloud saves?
Yes, Serious Sam: Siberian Mayhem uses Steam Cloud, so your saves sync across devices.
FAQ
Where is the cheapest place to buy a Serious Sam: Siberian Mayhem key?
The cheapest Serious Sam: Siberian Mayhem key is currently sold by K4G for €5.74. That is the best of 16 offers we compare; prices are refreshed regularly. The lowest price we have ever recorded for this game: €4.87.
How much does Serious Sam: Siberian Mayhem cost?
Serious Sam: Siberian Mayhem currently costs from €5.74 — the cheapest offer across the stores we track. For comparison, the game costs €19.50 on Steam, so buying a key saves you about 71%.
Is K4G an official store or a keyshop?
K4G is a keyshop (marketplace) where independent sellers list keys, so prices are often lower than in official stores. Every offer on ulov.gg is clearly labeled with its store type.
Are keys from these stores legal?
Buying is legal — keys come from the grey market, so a small deactivation risk exists. So before paying, check the seller's buyer protection.
Which key region should I pick?
Global activates everywhere. Regional keys (Europe, North America, RU-CIS) only work on accounts from that region — use the Region filter to match your account.
What is an activation platform?
The service where the key activates — Steam, GOG, Epic or the publisher's platform. A key for one platform won't work on another, hence the separate filter.
What's the difference between editions?
Standard is the base game; Deluxe usually adds an expansion or bonus content. The edition filter shows exactly that variant, with no mixed prices.