Alien Swarm
Alien Swarm is a game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Available free of charge, the game thrusts players into 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 ...
Popular Space / Planets Maps
3 Maps Co-Op Campaign
Welcome to the harsh planet of Tarnor. A nearly airless rock circling an anci... More >
Updated 09/29/14
Author Ezekel

Rating
2 Dead City
Co-Op
An epic bug hunt featuring a unique blend of co-op play and squad-level tacti... More >
Updated 03/06/14
Author Daniel101

Rating
3 The Dead Temple
5 Maps Co-Op Campaign
There are five missions in this Campaign. All the missions have specific obj... More >
Updated 09/26/14
Author Xacktar

Rating
Popular Content (Today)
Co-Op
An alien swarm map for everyone to enjoy! Hope you like it. More >
Updated 03/05/14
Author hemuuuli

Rating
2 Drone Lab
Co-Op
This map/campaign is in the early stages, and I thought that I should release... More >
Updated 03/06/14
Author XionOfChaos

Rating
3 survival_outpost_snow
Holdout
This is a survival map You have to hold out in an outpost for 10 minutes and ... More >
Updated 09/26/14
Author Asus

Rating
4 Ground Zero
2 Maps Co-Op Campaign
Your mission was to find and destroy a secret alien lab. Now you have crash l... More >
Updated 09/30/14
Author BioHazard

Rating
5 The Dead Temple
5 Maps Co-Op Campaign
There are five missions in this Campaign. All the missions have specific obj... More >
Updated 09/26/14
Author Xacktar

Rating
6 Dead City
Co-Op
An epic bug hunt featuring a unique blend of co-op play and squad-level tacti... More >
Updated 03/06/14
Author Daniel101

Rating
7 Extermination
7 Maps Co-Op Campaign
Extermination is a campaign which unites these maps: Midnight harvest 1 Midni... More >
Updated 03/14/14
Author geotavros

Rating
8 Nepumax' Colorful Marines
Marines
This pack includes recolored marine skins for Alien Swarm. * INSTALL INSTRUC... More >
Updated 09/26/14
Author Nepumax

Rating
9 Outpost 5
Co-Op
This is a Tilegen but I tried to add enough detail and change it up enough to... More >
Updated 09/26/14
Author larrybrains

Rating
10 Lost Cause
Holdout
Hold off against the swarm in this survival map. You have to keep alive for a... More >
Updated 09/26/14
Author daniel10166

Rating
Popular Content (Monthly)
Co-Op
An epic bug hunt featuring a unique blend of co-op play and squad-level tacti... More >
Updated 03/06/14
Author Daniel101

Rating
2 robot-1
Marines
1_ Extract the .ZIP file. 2_ Move the robot-1.vpk file to ":\Program files\St... More >
Updated 09/26/14
Author lucas rojas

Rating
3 Ground Zero
2 Maps Co-Op Campaign
Your mission was to find and destroy a secret alien lab. Now you have crash l... More >
Updated 09/30/14
Author BioHazard

Rating
4 Cold Catwalks
Co-Op
An alien swarm map for everyone to enjoy! Hope you like it. More >
Updated 03/05/14
Author hemuuuli

Rating
5 Holdout_pr
Holdout
Holdout Hi all. New version is 1.9 Added Briefing map. Added wind sound. Adde... More >
Updated 09/26/14
Author Proker

Rating
6 Drone Lab
Co-Op
This map/campaign is in the early stages, and I thought that I should release... More >
Updated 03/06/14
Author XionOfChaos

Rating
7 Extermination
7 Maps Co-Op Campaign
Extermination is a campaign which unites these maps: Midnight harvest 1 Midni... More >
Updated 03/14/14
Author geotavros

Rating
8 Lost Cause
Holdout
Hold off against the swarm in this survival map. You have to keep alive for a... More >
Updated 09/26/14
Author daniel10166

Rating
9 survival_outpost_snow
Holdout
This is a survival map You have to hold out in an outpost for 10 minutes and ... More >
Updated 09/26/14
Author Asus

Rating
10 Holdout
Holdout
A quick survival map I created...and yes, it was significantly edited from it... More >
Updated 09/26/14
Author Echo

Rating
Space / Planets
3 Maps
3 Maps Co-Op Campaign
Welcome to the harsh planet of Tarnor. A nearly airless rock circling an anci... More >
Updated 09/29/14
Author Ezekel

Rating
Welcome to the harsh planet of Tarnor. A nearly airless rock circling an ancient Red Giant, the planet is subject to baking heat in the day and freezing colds at night. Despite the unforgiving nature of the planet, the bustling colony of Oasis thrives on the surface as a major trading hub. It's often been said that whatever you need you can find it at Oasis, for a price. However, the colony has...
3 Maps
3 Maps Co-Op Campaign
Welcome to the harsh planet of Tarnor. A nearly airless rock circling an anci... More >
Updated 09/29/14
Author Ezekel

Rating
5 Maps
5 Maps Co-Op Campaign
There are five missions in this Campaign. All the missions have specific obj... More >
Updated 09/26/14
Author Xacktar

Rating
There are five missions in this Campaign. All the missions have specific objectives. Images for the addon and each mission on the selection screen have been added. Minimaps are available for 4 out of 5 missions. PDAs and Radio transmissions will convey the storyline. Some of the non-objective PDAs are not obvious, so keep an eye out. BACKSTORY You play a Marine attached to the TMF Sisyph...
5 Maps
5 Maps Co-Op Campaign
There are five missions in this Campaign. All the missions have specific obj... More >
Updated 09/26/14
Author Xacktar

Rating
Co-Op
An epic bug hunt featuring a unique blend of co-op play and squad-level tacti... More >
Updated 03/06/14
Author Daniel101

Rating
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...
Co-Op
An epic bug hunt featuring a unique blend of co-op play and squad-level tacti... More >
Updated 03/06/14
Author Daniel101

Rating