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Sam "Serious" Stone returns in the first standalone expansion for Serious Sam 4. Serious Sam: Siberian Mayhem brings back the bullet hell mayhem and all the action of the series to deliver loads of fun in this new adventure that takes you to the East, in the frozen steppes of Syberia and beyond. This time, you will take on a series of missions that will pit you against the traitorous General Brand and his minions. Mental's Horde will pose a new challenge with the addition of new types of enemies, and you will require additional firepower to take them down. But don't falter because there will be new weapons, gadgets, and vehicles at your disposal too, including an experimental crossbow able to shoot deadly projectiles and more.
Serious Sam: Siberian Mayhem features challenging combats through a wide variety of scenarios that include Arctic coastlines, frozen tundra, abandoned villages, and deserted snow-covered forests. Explore these lands to your heart's content and hunt down General Brand in this new epic adventure for Serious Sam.
Serious Sam: Siberian Mayhem
Sam "Serious" Stone returns in the first standalone expansion for Serious Sam 4. Serious Sam: Siberian Mayhem brings back the bullet hell mayhem and all the action of the series to deliver loads of fun in this new adventure that takes you to the East, in the frozen steppes of Syberia and beyond. This time, you will take on a series of missions that will pit you against the traitorous General Brand and his minions. Mental's Horde will pose a new challenge with the addition of new types of enemies, and you will require additional firepower to take them down. But don't falter because there will be new weapons, gadgets, and vehicles at your disposal too, including an experimental crossbow able to shoot deadly projectiles and more.
Serious Sam: Siberian Mayhem features challenging combats through a wide variety of scenarios that include Arctic coastlines, frozen tundra, abandoned villages, and deserted snow-covered forests. Explore these lands to your heart's content and hunt down General Brand in this new epic adventure for Serious Sam.
Serious Sam: Siberian Mayhem
GamingDragons
This key will allow you to play on PC
This key is meant to be activated on GOG Galaxy.
Serious Sam: Siberian Mayhem
Kinguin
Kinguin is recognized as a "top retailer" by DLCompare thanks to their quality of service, competitive prices and the recognition they gained amoung users.
This key will allow you to play on PC
This key is meant to be activated on Steam.
discount code -10% : DLC10
Serious Sam: Siberian Mayhem
GAMIVO
This key will allow you to play on PC
This key is meant to be activated on Steam.
discount code -6% : DLCOMPARE6
Serious Sam: Siberian Mayhem
Eneba
Eneba is recognized as a "top retailer" by DLCompare thanks to their quality of service, competitive prices and the recognition they gained amoung users.
This key will allow you to play on PC
This key is meant to be activated on Steam.
discount code -3% : 3DLC
Serious Sam: Siberian Mayhem
Kinguin
Kinguin is recognized as a "top retailer" by DLCompare thanks to their quality of service, competitive prices and the recognition they gained amoung users.
This key will allow you to play on PC
This key is meant to be activated on Steam gift.
discount code -10% : DLC10
Serious Sam: Siberian Mayhem
Humble Bundle
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You'll receive your cd keys as text or image by e-mail, or by mail for your retail boxes or hardware.
This key will allow you to play on PC
This key is meant to be activated on Steam.
Serious Sam: Siberian Mayhem
Fanatical
Fanatical is an official store which you can identify with this icon
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You'll receive your cd keys as text or image by e-mail, or by mail for your retail boxes or hardware.
This key will allow you to play on PC
This key is meant to be activated on Steam.
Serious Sam: Siberian Mayhem
HRKGAME
This key will allow you to play on PC
This key is meant to be activated on Steam.
Serious Sam: Siberian Mayhem
G2PLAY
This key will allow you to play on PC
This key is meant to be activated on Steam.
discount code -3% : DLC3
Serious Sam: Siberian Mayhem
G2PLAY
This key will allow you to play on PC
This key is meant to be activated on Steam gift.
discount code -3% : DLC3
Serious Sam: Siberian Mayhem
Gamebillet
Gamebillet is an official store which you can identify with this icon
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You'll receive your cd keys as text or image by e-mail, or by mail for your retail boxes or hardware.
This key will allow you to play on PC
This key is meant to be activated on Steam.
Serious Sam: Siberian Mayhem
Gamesplanet
Gamesplanet is an official store which you can identify with this icon
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You'll receive your cd keys as text or image by e-mail, or by mail for your retail boxes or hardware.
This key will allow you to play on PC
This key is meant to be activated on Steam.
Serious Sam: Siberian Mayhem
Gamesplanet US
Gamesplanet US is an official store which you can identify with this icon
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You'll receive your cd keys as text or image by e-mail, or by mail for your retail boxes or hardware.
This key will allow you to play on PC
This key is meant to be activated on Steam.
Serious Sam: Siberian Mayhem
Instant Gaming
Instant Gaming is recognized as a "top retailer" by DLCompare thanks to their quality of service, competitive prices and the recognition they gained amoung users.
This key will allow you to play on PC
This key is meant to be activated on Steam.
Serious Sam: Siberian Mayhem
GOG.com
GOG.com is an official store which you can identify with this icon
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You'll receive your cd keys as text or image by e-mail, or by mail for your retail boxes or hardware.
This key will allow you to play on PC
This key is meant to be activated on GOG Galaxy.
Serious Sam: Siberian Mayhem
Steam
Steam is an official store which you can identify with this icon
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You'll receive your cd keys as text or image by e-mail, or by mail for your retail boxes or hardware.
This key will allow you to play on PC
This key is meant to be activated on Steam.
Serious Sam: Siberian Mayhem
Kinguin
Kinguin is recognized as a "top retailer" by DLCompare thanks to their quality of service, competitive prices and the recognition they gained amoung users.
This key will allow you to play on PC
This key is meant to be activated on Steam gift.
discount code -10% : DLC10
Serious Sam: Siberian Mayhem
G2A
This key will allow you to play on PC
This key is meant to be activated on Steam gift.
pay back -3% : DLCOMPARE
Serious Sam: Siberian Mayhem
GAMIVO
This key will allow you to play on PC
This key is meant to be activated on Steam gift.
discount code -6% : DLCOMPARE6
Serious Sam: Siberian Mayhem
G2PLAY
This key will allow you to play on PC
This key is meant to be activated on Steam gift.
discount code -3% : DLC3
Serious Sam: Siberian Mayhem
Difmark
This key will allow you to play on PC
This key is meant to be activated on Steam gift USA.
It is a USA only key.
discount code -10% : DLCOMPARE
Serious Sam: Siberian Mayhem
Difmark
This key will allow you to play on PC
This key is meant to be activated on Steam gift.
discount code -10% : DLCOMPARE
Serious Sam: Siberian Mayhem
Wyrel
This key will allow you to play on PC
This key is meant to be activated on Steam gift USA.
It is a USA only key.
discount code -6% : DLCOMPARE
Serious Sam: Siberian Mayhem
Wyrel
This key will allow you to play on PC
This key is meant to be activated on Steam gift.
discount code -6% : DLCOMPARE
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Use your CD key on Steam to download Serious Sam: Siberian Mayhem.
Use your Serious Sam: Siberian Mayhem cd key and download your game on GOG GALAXY
Serious Sam: Siberian Mayhem will be sent to you as a Steam gift link without any geographic restriction.
Serious Sam: Siberian Mayhem
GOG GALAXY is a fully optional client to install, play, and update your games. It also offers online multiplayer, achievements, chat, game-time tracking and more - but it’s up to you which features you want to use.
For Steam CD Keys, you must download (HERE), install the Steam software and create a new account. If you already have a Steam account, once you log in, click "Add a game" (located in the bottom left corner), and then "Activate a Product on Steam". After a few more clicks, you will be prompted to type in your CD Key. Thus, the game will be activated and automatically added to your account library.
To use a Steam gift game, you need to own a Steam account and use the link provided to add the game to your library.
To use a Steam gift game, you need to own a Steam account and use the link provided to add the game to your library.