Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (227 reviews) - 93% of the 227 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (14,735 reviews) - 95% of the 14,735 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 Sept. 2016! Learn more
Recent:
Very Positive (227 reviews)
Overall:
Overwhelmingly Positive (14,735 reviews)
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7,354 reviews match the filters above ( Overwhelmingly Positive)
Most Helpful Reviews  In the past 30 days
13 of 13 people (100%) found this review helpful
2 people found this review funny
Recommended
55.9 hrs on record
Posted: September 5
Alien Swarm is a fantastic, top down co-op shooter which deserves more recognition than it got. While it only has a short campaign (which can be played with up to four friends), there are many addon campaigns and mods online, which make a substantial difference to the experience.

Best played with friends, there is still an active community around this game, so finding other players shouldn't be too difficult. The standard campaign provides decent challenge and entertainment, especially when you increase the difficulty.

Best part? Its completely free... you have nothing to lose by giving it a try.
Was this review helpful? Yes No Funny
11 of 12 people (92%) found this review helpful
5 people found this review funny
Recommended
3.3 hrs on record
Posted: August 31
Valve did a thing its pretty cool
Was this review helpful? Yes No Funny
9 of 10 people (90%) found this review helpful
2 of 2 people (100%) found this review helpful
Recommended
0.6 hrs on record
Posted: August 31
Outta all the free 2 play games i played for tf2 hats, i think alien swarm was the most pleasing one. I would play alien swarm again for sure. Definately play this game if you want a decent free 2 play game or a really old tf2 hat.
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2 of 2 people (100%) found this review helpful
Recommended
35.6 hrs on record
Pre-Release Review
Posted: September 26
Atmospheric:
The aliens in the vents make their noises,
and the motion scanner bleeps kep you on the edge of your seat,
and make you fall off when you wander into an ambush.

Hard:
This game requires tactical eye and teamwork
between you and your squadmates.
You must play smart and look after each other,
because that is one less gun in the game,
and your chances of survival become very slim at best.

Fair:
If you get eaten it means 'you dun goofed up'.
Tie game doesn't resort to cheating.
The alien AI is quite smart and they can
easily outsmart you if you aren't paying attention.

Fun?:
Alone:
It can be fun, if you are skilled enough
and are used to RTS games. But it can be
frustratingly hard solo.

With 1-3 friends:
Two-player game is quite fun, but this game shines
with a full squad of human players as you struggle
on towards your objective, counting on each other,
and hoping you can pull it off without any hirches,
and that everyone survives.

Of course, this is where friendly fire comes into play.
'Friendly fire is not'. You WILL take damage from squadmates.
In the beginning you are more likely to die from
a squadmate trying to shoot an alien trough you
than the actual alien.

In this game players need
good communication and discipline to make it trough
while still being ready to take action at any time.
This doesn't mean this game is meant for twitch players.
I'd say it is quite the opposite.
You can survive by playing the game as a twitch action shooter,
but you can negate need for reflexes with some
tactical awareness and being in the right place at the right time
and anticipating the enemy.

The only negative things I can say about this game is
that there aren't many enemy types and the
main campaign included is a little short.
I really do wish they added more official maps to this game.

Overall?
This game is hard. But incredibly rewarding. And free.
Definitely worth adding to your Steam library and giving it a spin.
So what are you still waiting for?
Click that "Play Game" button already!

LOCK AND LOAD!

P.S. Did I mention you also get a free hat for Team Fortress 2?
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2 of 2 people (100%) found this review helpful
2 people found this review funny
Recommended
14.9 hrs on record
Pre-Release Review
Posted: September 17
I kicked my friend in the back of the head for failing the team and it sent him flying out the map
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1 of 1 people (100%) found this review helpful
Recommended
0.8 hrs on record
Posted: September 2
9/10

Nice free coop game. Came for the TF2 hat, stayed for the nice game.
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1 of 1 people (100%) found this review helpful
Recommended
14.4 hrs on record
Posted: September 1
the game itself its awesome but sadly not many people are playing itso for theses people who are new into this game you better have a least an other player to play it. its more fun.

so 10/10 its free and its awesome.
but like i said before not many people are playing it.
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1 of 1 people (100%) found this review helpful
Recommended
20.6 hrs on record
Posted: September 17
great game, still is holding up in the graphics department since 2010. best played with a friend who screams at everything and over all leveling to max level is satisfying.
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1 of 1 people (100%) found this review helpful
Recommended
4.9 hrs on record
Posted: September 16
10/10 would frag teammates again

Wish they added more campaigns
Was this review helpful? Yes No Funny
Recently Posted
Caroline❤ The Queen of Angel
1.7 hrs
Posted: September 29
Just like Half Life xD
Helpful? Yes No Funny
[PuLSe] LoopeR
9.6 hrs
Posted: September 29
Great job!! valve Wow...Free coop game
Helpful? Yes No Funny
lilWolfRaven
32.1 hrs
Posted: September 29
Best Co-op bug shooter game in steam store.
Helpful? Yes No Funny
Keemstar
0.9 hrs
Posted: September 29
5 LEVELS but worth
Helpful? Yes No Funny
N E C R 0
2.1 hrs
Posted: September 29
Only people left playing this game are a handful of overfed micropenis teenagers who friendly fire on you because you weren't in the group of 3 friends, and then they kick you out because you called them a bunch of overfed micropenis teenagers.

Dead game, and the laughable handful of people left playing are sewer-born levels of degenerate.
Helpful? Yes No Funny
Wesley
114.7 hrs
Posted: September 29
I LOVE THIS GAME, it's so addicting and fun!! I recommend this to everyone, best way of playing it is with a group a friends.
10/10
Helpful? Yes No Funny
tj13610
3.1 hrs
Posted: September 29
I played through this game a few weeks ago on a late night with three friends. It was one of my favorite and most memorable experiences on Steam. At the low price of $0.00 this game was infinitely worth the price.
Helpful? Yes No Funny
Calum {Soldier Main} | trade.tf
1.8 hrs
Posted: September 29
really good i like it allot
Helpful? Yes No Funny
Adiamsyar
0.6 hrs
Posted: September 29
Recommend.
Helpful? Yes No Funny
(G.E.W.P) GamerPichu
3.9 hrs
Posted: September 28
Good Game.
Helpful? Yes No Funny