Co-operative multiplayer game and complete code base available for free.
User reviews:
Recent:
Very Positive (234 reviews) - 93% of the 234 user reviews in the last 30 days are positive.
Overall:
Overwhelmingly Positive (14,711 reviews) - 95% of the 14,711 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 (234 reviews)
Overall:
Overwhelmingly Positive (14,711 reviews)
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7,340 reviews match the filters above ( Overwhelmingly Positive)
Recently Posted
Bullclip
13.4 hrs
Posted: September 26
One of the better games i've played 9/10
Helpful? Yes No Funny
the.waves.of.time
10.5 hrs
Posted: September 26
Really fun and well optimized co-op game. To be honest this is the best co-op game I have come across for a long time (if not the best period)

Pros:
- Surprisingly good graphics – I expected something with really bad graphics but after setting qhd resolution and all the shadows on max
- Great optimization – game is really fluent no fps drops, not a lot of lags
- Almost no bugs (we only once encountered immortal alien who killed every one of us)
- Variety of tactics – every mission is different you cannot just smash every mission with one weapons set or one character, you need to think a lot and cooperate a lot
- Difficulty – you need to be focused and really cooperate with your team members – if you will be just rushing ahead with no plan you are going to go down and you will do it fast
- Weapons and equipment variety
- Levelling – you cannot really go op what is a good thing and levelling is a good way to introduce new equipment
- Its free and I have not seen any micro-payments

Cons:
- Way too short – just one campaign with few missions – joke – and most of the online fan-missions are nowhere near as good as the first campaign (Poorly designed and 70% of them are: survive 7 waves)
- Some of the weapons and equipment are way too weak and useless and some are really strong (example: slow high damage rifles are not very useful whereas minigun, flamer and sentry gun are really powerful\
- Quickly gets boring as not enough missions is supplied with a game

All in all I would recommend this game to anyone who is looking for a good coop to play with friends and a great time-killer. I cannot really downrate it because it is too short as it is free but I would gladly buy it for lets say fiver.
Helpful? Yes No Funny
SoanoS
35.6 hrs
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?
Helpful? Yes No Funny
GamesFrontline
5.5 hrs
Posted: September 25
For Free ? WHOA!!
Helpful? Yes No Funny
Nefalol
30.9 hrs
Posted: September 25
This game... It's just a great game, but It does lack some features maybe they can release alien swarm 2 or something like that. The only thing I want out of this game is... Longer Campaigns yup.. and that's It. I rate it a 9.5/10
Helpful? Yes No Funny
WRK! ♛☠10001011101☜(˚▽
5.8 hrs
Posted: September 24
+PT-BR+
Não tenho muito a falar sobre,só digo que é bom e divertido,além de desbloquear um chapéu no TF2(e não é dificil)

+ENG+
I don't have much to say,i'ts good and fun,it also unlocks a TF2 hat(it's not hard)
Helpful? Yes No Funny
ColtoJiro
1.5 hrs
Posted: September 24
Awesome action, concept, easy controls once you get the handle of it, and I absolutely love it :)
Helpful? Yes No Funny
Ratchet
71.8 hrs
Posted: September 24
Its awsome, I love the shotguns, chainsaw, minguns, ect. I got to play online thats realy fun, I can play with tons of a going from players 2 all the way to 100. I think that you will realy like it, because tons of epic maps, werpons, marins, and you don't have to pay for any thing!
Helpful? Yes No Funny
CK.PCC_Jazz
3.4 hrs
Posted: September 24
A very challenging co-op game. Easy and fun. Intense but not draining. And its FREE!
Helpful? Yes No Funny
Crafted Diamond
0.4 hrs
Posted: September 24
I Have played this game someone was trying to reprogram and we all got killed so i ragequited and i will delete it
Helpful? Yes No Funny
Most Helpful Reviews  In the past 30 days
15 of 16 people (94%) found this review helpful
3 people found this review funny
Recommended
1.4 hrs on record
Posted: August 28
I Originally came here for the Team Fortress 2 Hat, But boy was i amazed, This game is absolutely amazing the story and voice acting was Perfect its Challenging, And requires Effort and Team work, I Played this with one of my Close Friends And we had loads of fun as i was shooting Aliens while he hacked, Definetley going back to this Game, The Graphics are good it Has some horror to it and i liked it

===Pros===
+Challenging
+Good Graphics
+Good Strategy
+The Hacking system was PERFECT
+Every class is important
+There are 2 healers and both are different witch make it unique
+You can be any class with any weapons, Healer with Minigun ETC.
===Cons===
-Aliens all look the Same
-Not much Missions
-Not much options Like Turning off Friendly fire ETC.

This game is Amazing i will surely revisit it with loads of other people, Definitely Worth a Look
9.5/10
Was this review helpful? Yes No Funny
11 of 11 people (100%) found this review helpful
1 person 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
10 of 11 people (91%) found this review helpful
4 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
5 of 5 people (100%) found this review helpful
1 person found this review funny
Recommended
3.7 hrs on record
Posted: August 27
Super fun game. Playing this with friends was seriously a blast. We are very sad that there were just a few levels. Playing through this game was grreat but shortlived. If alot of levels were added then I wouldn't even mind paying a few bucks for it. Overall I would highly recommend getting 3 friends to play together with, I mean seriously... IT'S FREE WHY WOULDN'T YOU?
Was this review helpful? Yes No Funny
6 of 7 people (86%) found this review helpful
Recommended
43.4 hrs on record
Posted: September 2
This game shouldn't be dead
Was this review helpful? Yes No Funny
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.
Was this review helpful? Yes No Funny
2 of 2 people (100%) found this review helpful
Recommended
9.0 hrs on record
Posted: August 27
The stigma that most "Free" games have means that this game itelf isn't very popular, which is a shame because it should be:

*It helps encourage teamplay
*It's campaign still offers a lot of challenge
*It's one of the best top-down shooters Steam has - at the very low price of, well, free.

There aren't enough people playing this game, and that's the biggest problem the game has.
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2 of 2 people (100%) found this review helpful
3 people found this review funny
Recommended
3.2 hrs on record
Posted: August 29
The one game my girlfriend can beat me in :/
Was this review helpful? Yes No Funny
1 of 1 people (100%) found this review helpful
Recommended
6.8 hrs on record
Posted: September 3
Good game. Sadly Valve has never added anything to the game since release. The game is very challenging, dying on easy is pretty easy even with friends, depending on which mission you are on. The screams of aliens add a little bit of horror too. Get the game if you have friends. You can get a TF2 hat out of this too.
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1 of 1 people (100%) found this review helpful
Recommended
0.6 hrs on record
Posted: September 2
Great graphics also pretty hard to take care alone here some tips to survive and win the games.

1. Teamwork.
2. Don't wasted ammo and use your stuff on right time.
3. Don't too close with alien because they can hit you from bit longer distance and make 2x hit if I remember and don't rush too much.

That only i know.
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