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Serious Sam: Siberian Mayhem is a first-person shooter video game developed by Croteam and Timelock Studio and published by Devolver Digital. It is a new stand-alone expansion pack and it's part of the Serious Sam series. It was released on January 25 2022 for Microsoft Windows.


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Like Serious Sam 4, some weapons come with additional secondary fire modes that need to be equipped first. Unlike Serious Sam 4 however these do not need to be unlocked through side-quests and can simply be found in briefcases along the main path, so be careful not to run past them.

  • 12 Gauge Pump-Action Shotgun: A classic weapon from other Serious Sam games. Like the Serious Sam 1 version, it doesn't have to be reloaded.
    • Grenade launcher attachment - The grenade launcher attachment launches grenades as a secondary fire option. It can be mounted on the pump-action shotgun.
  • Autoshotgun: An automatic shotgun that fires shells to deal a rapid and powerful attack at close range. It holds a magazine of 20 shells and has to be reloaded after expending its magazine. It is a now a secret weapon in this game, and can only be found in a hidden area.
  • C-4 Demolition Charge: A throwable plastic explosive. Once it's triggered, it deals extreme damage over a wide area. It can also be attached to a enemy and can also destroy structures such as pillars, statues and walls once thrown.
  • Combat Knife: A classic melee weapon from Serious Sam 1. It can be used to slash weak enemies at close range or deliver finishing blows.
  • Double Barrel Coach Gun: A powerful double-barrel shotgun that can deal heavy damage once close-range. It also reloads faster.
  • AK74MX: A classic Russian assault rifle holding 50 bullets per magazine and a standard sight. This rifle can fire accurate shots from a distance.
  • MK III Grenade Launcher: A weapon returning from Serious Sam 1. This grenade launcher can fire grenades over large obstacles and can deal damage at close range enemies. Grenades can explode after 3 seconds once it's fired or can explode directly into a enemy.
    • Remote trigger: A secondary fire mode for the grenade launcher. Detonates grenades that have been fired into smaller grenades that explode a short time afterwards.
  • SBC Cannon: An iconic weapon from the Serious Sam games. This portable cannon can fire explosive powered cannonballs at enemies and is useful at mowing down hordes of enemies in a row.
  • SOP38 Pistol: A semi-automatic handgun that can deal damage to only weak enemies and can be aimed down the sights.
  • TCC2 "Perun" Crossbow: A long-range electric crossbow with a sniper scope, devastating enemies with accurate, high-damage shots.
  • XM214-A Minigun: A very powerful and rapid-firing weapon that has an extreme rate of fire and can deal extreme damage to hordes of weak enemies.
  • XPML21 Rocket Launcher: An experimental rocket launcher that can fire missiles and can deal heavy damage on armored enemies. The loading mechanism is similar to Serious Sam 3: BFE.
    • Multi-launcher mode with target lock: A secondary fire mode for the rocket launcher. Loads up to five homing rockets that will lock onto enemies when fired.
  • XPMR "Burner" Raygun: An experimental thermal beam reverse-engineered from Draconian Burners. After a brief heating time it fires a long distance beam at whatever it's pointed at, quickly heating up enemies up to 2500°C. If held on an enemy long enough they will explode upon death, damaging anything close to them. Enemies not killed will cool down over time.


Also returning from Serious Sam 4, gadgets are unique objects that can only be used once and are found either as secrets or as rewards for completing side quests. They can be selected through the player's weapon wheel.

  • Black Hole: An object that contains a miniature black hole that can suck and pull in enemies.
  • Hacked Drone: A hacked Octanian drone that will protect the player and fire upon enemies for a while before it explodes.
  • H.E.A.R.T.: A portable defibrillator which revives the player when they die.
  • Hoverboard Scooter: A deployable, fast-moving vehicle with laser guns mounted on it. It starts off with 750 fuel, which depletes by moving around and/or shooting the laser guns. Unlike other vehicles it is not possible to shoot other weapons while on it.
  • L.I.F.E.: Functions just like a health pickup. When used, it will give the player a boost of 50 health.
  • Mini-Nuke: A surface-to-surface missile that creates a massive explosion when detonated, killing all enemies within the range of the blast.
  • Rage Serum: A performance-enhancing drug that increases the player's speed, strength and endurance.
  • T.A.C.T.: A targeting device that calls down an air strike in a large radius around wherever it's aimed at.
  • Time Warp: A strange device of Sirian origin that slows down time when activated. Enemies will be slowed down while the player is unaffected.


Skill Tree[]

Warning: Only up to 10 skills may be used as only 10 S.A.M. eggs can be found in the entire campaign. Note that unlike Serious Sam 4, the Dual Wield Harder and Born To Run are also connected to the Full Speed Ahead and The Bigger They Are skills respectively, allowing easier access to the skills you want.

  • Healing Punch (gain health upon melee kill)
    • Long Distance Relationship (increases the range from which melee attacks can be made)
      • Objection, Your Honor (allows the player to use melee weapons found in the environment (like lamposts or stop signs) as melee weapons
      • The Bigger They Are (allows for melee attacks on medium sized enemies like Scrapjacks or female Gnaars)
        • Rodeo Time (allows the user to mount and drive large enemies like Khnums, Octanian Zealots or Sirian Werebulls)
        • The Harder They Fall (Allows for melee attacks on almost all enemies)
  • Looter Shooter (enemies occasionally drop ammo upon death)
    • The Quick And The Dead (all weapons gain a faster reload time (should they have a reload))
      • Unflinching (reduces all splash damage taken by 50%)
      • Full Speed Ahead (increases rate of fire for all weapons that have a reload, after reloading)
        • Beserker (increases damage as health decreases)
    • Dual Wield (allows the player to use 2 knives and pistols at once, use the aim button to use the alternate weapons)
      • Born To Run (allows for the use of weapons during sprinting)
        • Footsure (allows for aiming down the sight while walking normally)
      • Dual Wield Harder (allows for the dual-wielding of medium weapons such as shotguns, assault rifles and Devastator)
        • Dual Wield With A Vengeance (allows for all weapons to be dual-wielded)
          • Mix It Up (allows for any combination of weapons to be dual-wielded)


Serious Sam: Siberian Mayhem features online multiplayer just like the previous games. Just like Serious Sam 4, cooperative mode and co-op survival returns with up to a maximum of 4 players.

As of now, Serious Sam: Siberian Mayhem does not have any Versus modes, but these could possibly be added in a future update. It is unknown if 16-player co-op and coin co-op could return or not.


To be added.


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External Links[]