An epic bug hunt featuring a unique blend of co-op play and squad-level tactics. With your friends, form a squad of four distinct IAF Marine classes. Plan your attack using an unlockable arsenal of weapons with countless loadout configurations against a wide variety of aliens. Blaze your way through an overrun, off-world colony, eradicating the alien infestation in environments ranging from the icy planet's surface, to a subterranean lava-flooded mining facility.

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Lambda Wars
Alien Swarm

93% - Lambda Wars

1 week ago Released 2012 Single & Multiplayer Real Time Strategy

Lambda Wars (formerly Half-Life 2: Wars) brings the struggle between the human resistance and their Combine overlords to a multiplayer real-time strategy...

Hypovolemia
Alien Swarm

88% - Hypovolemia

1 month ago Released 2012 Single & Multiplayer Third Person Shooter

HYP is real time tactical shooter with chess like awareness and high skill ceiling. The game focuses on intricate game design while offering a unique...

Alien Swarm Director Mod
Alien Swarm

97% - Alien Swarm Director Mod

1 year ago Released 2011 Single Player Third Person Shooter

Welcome to the Alien Swarm Director Mod! ASDM is a single player Alien Swarm mod focusing on increasing replayability by creating a dynamic experience...

Alien Swarm:SP
Alien Swarm

95% - Alien Swarm:SP

2 years ago Released 2011 Single Player Third Person Shooter

Play the official Alien Swarm maps and any addons through the Offline Practice mode. Alien Swarm:SP also supports a large amount of configurable changes...

Alien Swarm SDK Template Conversion
Alien Swarm

94% - Alien Swarm SDK Template Conversion

3 years ago Released 2012 Single & Multiplayer First Person Shooter

C_b_fofep and I decided to convert the Alien Swarm build back into an FPS source engine version. This takes the orange box or the SDK template code and...

Alien Swarm Aliens Mod
Alien Swarm

80% - Alien Swarm Aliens Mod

4 years ago Released 2010 Single & Multiplayer Tactical Shooter

this "mod" will replace weapon's data and sounds for alien swarm making it feel like Aliens. Furthermore, maps will be made for this mod and the final...

Swarm Keeper
Alien Swarm

80% - Swarm Keeper

2 years ago Released 2012 Single & Multiplayer Real Time Strategy

Swarm Keeper is a Dungeon Keeper inspired modification for Alien Swarm. It offers the following features: Build a dungeon for your creatures (aliens...

Infested Office
Alien Swarm

35% - Infested Office

5 years ago Released 2010 Single & Multiplayer Third Person Shooter

A test of skill and teamwork, this addon/map pack challenges you and your team even on the easier difficulty settings.

IAF Weapon Drop
Alien Swarm

67% - IAF Weapon Drop

3 years ago Released 2012 Multiplayer Third Person Shooter

Almost all weapons were modified more or less noticeable. Some of them are big changes (like semi-auto Railguns and Sniper Rifles or Miniguns with lot...

Alien Swarm: Reactive Drop
Alien Swarm

71% - Alien Swarm: Reactive Drop

4 months ago Released Apr 9, 2014 Single, Multiplayer & Co-Op Arcade

Adds new PvP game modes, co-op features and singleplayer support into Alien Swarm without changing its concept.

Alien Haunt
Alien Swarm

68% - Alien Haunt

4 years ago Released 2010 Single & Multiplayer Adventure

Alien Haunt. A Map for Alien Swarm. 1 Campaign with 5 maps. Get ready to be swarmed by aliens!

Swarm Director 2
Alien Swarm

93% - Swarm Director 2

1 month ago Released Jul 4, 2014 Single & Co-op Third Person Shooter

Alien Swarm with a twist. Better AI, new mutations, new mapper tools.

Space Swarm Marines
Alien Swarm

80% - Space Swarm Marines

3 months ago Released May 5, 2015 Single, Multiplayer & Co-Op Third Person Shooter

New mod Space Marines for Alien Swarm. :)

Alien Swarm: Rifle Mod
Alien Swarm

100% - Alien Swarm: Rifle Mod

1 year ago Released Jan 1, 2014 Single & Co-op Arcade

Rifle Mod is an Alien Swarm server-only mod that forces players to play with assault rifles only, harder aliens, more ammo, smarter bots. However rifle...

ASB²  mod
Alien Swarm

90% - ASB² mod

3 years ago Released 2012 Multiplayer Tactical Shooter

ASB² mode (alien swarm beyond brutal) is a reborn ASBi game mode emphasizing the higher degree of difficulty, which includes the invalidity of such options...

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Alien Swarm
Platform
Windows
Developer & Publisher
Valve
Engine
Source
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Official Page
Alienswarm.com
Release Date
Released 2010
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Mods
15
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19
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-4
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Popular Mods
Lambda Wars (Alien Swarm)
Lambda Wars Alien Swarm - Single & Multiplayer Real Time Strategy
Black Mesa Swarm (Alien Swarm)
Black Mesa Swarm Alien Swarm - Single & Multiplayer First Person Shooter
The Survival (Alien Swarm)
The Survival Alien Swarm - Single Player First Person Shooter
Alien Swarm Director Mod (Alien Swarm)
Alien Swarm Director Mod Alien Swarm - Single Player Third Person Shooter
Vectronic (Alien Swarm)
Vectronic Alien Swarm - Single Player Puzzle Compilation
Hypovolemia (Alien Swarm)
Hypovolemia Alien Swarm - Single & Multiplayer Third Person Shooter
Swarm Director 2 (Alien Swarm)
Swarm Director 2 Alien Swarm - Single & Co-op Third Person Shooter
ASB²  mod (Alien Swarm)
ASB² mod Alien Swarm - Multiplayer Tactical Shooter
ALIENS (Alien Swarm)
ALIENS Alien Swarm - Single & Multiplayer Tactical Shooter
Modular Combat 2 (Alien Swarm)
Modular Combat 2 Alien Swarm - Multiplayer & Co-op First Person Shooter
SourceForts 2 (Alien Swarm)
SourceForts 2 Alien Swarm - Multiplayer First Person Shooter
Zombie Swarm. (Alien Swarm)
Zombie Swarm. Alien Swarm - Multiplayer Third Person Shooter
Alien Swarm: Reactive Drop (Alien Swarm)
Alien Swarm: Reactive Drop Alien Swarm - Single, Multiplayer & Co-Op Arcade
Omnibus (Alien Swarm)
Omnibus Alien Swarm - Single & Multiplayer Arcade
Optic (Alien Swarm)
Optic Alien Swarm - Multiplayer First Person Shooter