Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (292 reviews) - 93% of the 292 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (14,478 reviews) - 95% of the 14,478 user reviews for this game are positive.
Release Date: Jul 19, 2010

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"(Free) Co-operative multiplayer game and complete code base available for free. Made by Valve."

About This Game

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 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.
Along with the game get the complete code base for Alien Swarm that features updates to the Source engine as well as the SDK. Alien Swarm adds 3rd person camera, depth of field, improved dynamic shadows and a wide variety of gameplay additions to the Source engine.
  • Tactical, 4 player co-op action game with a top-down perspective
  • Complete game code and mod tools
  • Unlock persistent items by gaining levels
  • Over 40 weapons and equipment with countless loadout configurations
  • 4 unique classes and 8 unique characters
  • Matchmaking, Steam Cloud, Steam Stats
  • 64 achievements
  • Tile-based map generation tool
  • Powered by Source and Steam

System Requirements

    Minimum:
    • OS: Windows® 7 / Vista / Vista64 / XP
    • Processor: Pentium 4 3.0GHz
    • Memory: 1 GB for XP / 2GB for Vista
    • Graphics: DirectX 9 compatible video card with 128 MB, Shader model 2.0. ATI X800, NVidia 6600 or better
    • Hard Drive: At least 2.5 GB of free space
    • Sound: DirectX 9.0c compatible sound card
    Recommended:
    • OS: Windows® 7 / Vista / Vista64 / XP
    • Processor: Intel core 2 duo 2.4GHz
    • Memory: 1 GB for XP / 2GB for Vista
    • Graphics: DirectX 9 compatible video card with Shader model 3.0. NVidia 7600, ATI X1600 or better
    • Hard Drive: At least 2.5 GB of free space
    • Sound: DirectX 9.0c compatible sound card
Customer reviews
Customer Review system updated! Learn more
Recent:
Very Positive (292 reviews)
Overall:
Overwhelmingly Positive (14,478 reviews)
Recently Posted
☠Veigar Productions☠[YT]
10.7 hrs
Posted: August 25
A Really good Team Game.
But maybe needs more Chapters.
But Weapons and etc. are great.
Helpful? Yes No Funny
💗FruzenFuxxy💗#asleepshh
7.1 hrs
Posted: August 24
I love that game
Helpful? Yes No Funny
Ripbane
4.5 hrs
Posted: August 24
A based coop game, nice
Helpful? Yes No Funny
BONGO
1.1 hrs
Posted: August 24
god geam
Helpful? Yes No Funny
CBAR (GetS_ReKt ☯)
25.8 hrs
Posted: August 24
definitely worth a try :D and especially fun with friends :)
Helpful? Yes No Funny
Wehrmacht Wilhelm #TeamHoovy
2.3 hrs
Posted: August 24
Such a forgotten gem
Very fun with friends, there's really no reason not to download it

Also, you get a hat in tf2!
Helpful? Yes No Funny
camojj
0.6 hrs
Posted: August 23
nice game to play. easy controls but hard
Helpful? Yes No Funny
∑∆WaffleGuy∆∑
1.0 hrs
Posted: August 23
a LOT of fun because it is challenging and not many games nowadays are challenging
Helpful? Yes No Funny
SolҚﻪłł
1.5 hrs
Posted: August 22
Awesome twinstick shooter! can't believe it's FTP! no microtransactions or anything that brings it down! just really intense and fun action! :D reccomended!
Helpful? Yes No Funny
BornToRage
23.9 hrs
Posted: August 22
Extremely fun and replayable.
It's a small free game easy to pick and play.
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
17 of 21 people (81%) found this review helpful
4 people found this review funny
Recommended
0.2 hrs on record
Posted: August 5
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 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. Along with the game get the complete code base for Alien Swarm that features updates to the Source engine as well as the SDK. Alien Swarm adds 3rd person camera, depth of field, improved dynamic shadows and a wide variety of gameplay additions to the Source engine.
Was this review helpful? Yes No Funny
7 of 7 people (100%) found this review helpful
2 people found this review funny
Recommended
7.0 hrs on record
Posted: August 18
I know one thing , it will never go in game as you and your partner planned in lobby :v
Was this review helpful? Yes No Funny
5 of 5 people (100%) found this review helpful
1 person found this review funny
Recommended
10.4 hrs on record
Posted: August 5
good Co-op game, for LAN parties and such, but a very short story.
Was this review helpful? Yes No Funny
3 of 3 people (100%) found this review helpful
1 person found this review funny
Recommended
1.6 hrs on record
Posted: July 26
Awesome shooter game. 9/10
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
14.8 hrs on record
Posted: July 27
I remember playing this 24/7 awhile ago.Its an amazing teamwork isometric game where you cna get upgrades,new tools,and even new guns without any money required.Each role is important so good teamwork usually means you win.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
10.8 hrs on record
Posted: August 13
I liked it a lot. I liked that it had campaign, replayability to get the achievements, most I still want to get. I disliked that it was dropped...no more development.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
3.5 hrs on record
Posted: July 31
SUPER FUN! I always have a really fun time when i play this with my friends we play normal and hard mode. ITS SO FUN! There is a reason this game has had overwhelmingly positive reviews on steam. if you havent played this yet play it! though it's a shame that it was abandoned the game could have had more levels, more weapons and more different kinds of aliens :steamsad::steamsad:
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
0.4 hrs on record
Posted: August 5
This game isn't just free. It's AWESOME and it's free. Bird's eye view alien carnage with attention to detail. Skills (medic/welder/etc) and lots of action. This game is excellent to play with friends considering it can be a hoot to either casual your way through a level or go all in and try your hardest and coordinate as a team. Definitely worth your HDD space.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
9.0 hrs on record
Pre-Release Review
Posted: August 7
Alien Swarm....its hard to believe how long its been since this title was first released. It is a good game, a free game, and a short game. Its essentially a top down shooter (birds eye view), where you kill hordes of aliens as you progress. The campaign is quite short and story is minimalistic at best. Overall however its free with no gimmicks or cash shop, well worth the time to play casually so full recommend.
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
1 person found this review funny
Recommended
20.3 hrs on record
Posted: August 6
best coop played for hours
Was this review helpful? Yes No Funny