User Score

Generally favorable reviews- based on 394 Ratings

User score distribution:
  1. Negative: 17 out of 394

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  1. Aug 20, 2010
    This game, while small, is a great game from Valve that's like a top down version of Left4Dead except with alien bugs. It runs on the Source engine and enables people to make their own maps which is a plus. I like how weapons are unlockable but the default weapons still can stand a good chance against enemies on higher difficulties. Overall, it's free and I can't think of a reason not to buy it! Valve sure knows how to cater it's fans with free little gems like this game. Expand
  2. Aug 27, 2010
    Raw, free awesome. Make sure to play with people you are at least a little before going on modes harder than normal. Highest difficulty is where to go if you want a challenge and actual tactics. Also, expect to die on the harder modes at least as you first start out when you get better it becomes epic.
  3. Sep 27, 2010
    This game deserves a perfect 10 for being free. There's no reason at all for anybody to not own a free downloadable game. Therefore, everybody should have it. Reviews for this game are as useless as useless can be so dont try to judge it, just get it; BECAUSE ITS FREE!!!
  4. Aug 18, 2010
    The game is free, has a very good gameplay and especially playing it at insane difficulty with some friends is really really fun.
    The only thing that is missing is more campaign, but thanks to the SDK it is only matter of time. Great work!
  5. Aug 12, 2010
    It's been a while since i've played a top down shooter.
    And since this game was free I thought I'd give it a go. My first impressions of the game were exceptional, to put it in 1 word.
    Even though there's only 1 campaign to choose from but 6 or so sub levels within that. You get the impression this game should be a paid game. I was dissapointed on how many campaigns there were. But, it
    is a free game and you can't expect everything from it.
    The graphics are great on this game, it gives you an overall feel with the muzzle flashes and such.
    The weapons and characters are easily customisable and fully customisable in a matter of fact.

    All in all, love this game, worth getting for free.
  6. Aug 16, 2010
    It's free, the graphics run on a modified version of the Source engine, tons of aliens, L4D style game play, leveling, customizable weapon layouts, this thing is everything a game needs.
  7. Aug 25, 2010
    An excellent game by all accounts. Best with friends, and given that it's free, that's easy. Low internet requirements, but internet is required nonetheless.
  8. Sep 5, 2010
    Alien Swarm is free. If you like co-operative gameplay and frantic action then look no further. It does lack longevity, though the release of the SDK will no doubt spawn hundreds of player-made campaigns, but it's free, so it doesn't owe anything.
  9. h2o
    Sep 12, 2010
    This review contains spoilers, click expand to view. Ð¥Ð¾Ñ Expand
  10. Sep 23, 2010
    Considering that this is a free download from Valve, it's a largely impressive game. The view is top down, and you can choose to either alongside other people online, or go it alone and practice on the different difficulties. The unlockable weapons allow the user to get rewards for their progress and even with this doesn't necessarily make the game any different. The graphics for a game of its style are pretty good, and the spec's to run it aren't overly high. Basically, its free and its fun, so give it a try Expand
  11. Sep 23, 2010
    Free. Valve. Aside from that being a ridiculously awesome combination, the game itself is actually quite good. Building upon the Unreal Engine version of the game, the Source version is much more polished. MUCH MORE polished. There are a lot of unlockables, and the community is great with campaigns coming out regularly thanks to a version of the Source SDK being released in tandem with the game. The stock campaign is really nice too, and provides lots of fun. Coordination of firelines and such is a necessity because unless you use the [SPOILER?] cannon, in which case you don't have to worry about friendly fire. If you hit your teammates, it's your own fault, really. Expand
  12. Oct 16, 2010
    I consider myself an avid gamer. I am also trained in the "arts" of computer hardware and software development. Having said that, it is in my interest to produce a mmo co-op action game with short films released revealing what the main character, Dave Phenomus, did to save Humanity from Global Genocide. To be honest, a lot more brain-storming, and a team are required for my game. Alien Swarm is the perfect game to play for inspiration. For gamers in the top down co-op action genre. Have fun! Expand
  13. Oct 23, 2010
    Great and free. Better than the paid-for Alien Breed. The 4 player co-op can be intense. Good character leveling/tiny RPG elements and many, many weapons which are actually useful. Only drawback is the story is pretty short and the actions stay the same during all reruns.
  14. Nov 5, 2010
    This review contains spoilers, click expand to view. isometric shooter with 4 classes, leveling up, unlockable weapons, special attacks, 4 player co-op and a swarm of aliens to shoot, burn and smash. And all of it for free? I can't see any minuses in this... Expand
  15. Nov 6, 2010
    This game is awesome. Higher difficulties are challenging, but always fun. It mostly lacks re-playability, as the same strategies tend to work despite where and when the enemy may spawn. The game is short but its more than what I expected. On top of that, its free.
  16. Dec 13, 2010
    Alien Swarm encourages team-play better than any of the zombie shooters sold on Steam. You can play the game whether you are a beginner or a pro; you'll find that it offers challenge and fun for everyone. Game-play is well structured. Weapon unlocks function perfectly, alongside promotions and difficulty levels. As far as graphics go, Alien Swarm looks beautiful offering stunning visuals while not demanding too much from your computer. While there is currently only one official campaign, the dev team encourages community participation and there are many custom scenarios available. What's more, the game is free, so considering the price/quality ratio, this game deserves 10/10 any day of the week. Expand
  17. Feb 18, 2011
    I am one of the 'old guys', started gaming waaay back in the days that 8bit systems ruled the planet. And your imagination created the game, and not the graphical artist who was involved developing it. When I found this little gem I didn't know what to expect, something for free can't be that good, or can it?

    Well guess what, Valve really hit the nail on the head with this one: This is
    clearly inspired by the old "Alien Syndrome" games (SEGA), which made their way to the kids back in the late 80's on the commodore Amiga. In which mass slaughtering aliens with a big arsenal of weapons was basically the entire gameplay in a nutshell. Unlocking new items and weapons due to your previous achievements was what kept you coming back for more... the same can be said for this title.

    There has been a remake of Alien Syndorme on the PS2 and Wii, but both lacked on many of the attributes that motivated me back in the days. This title, which is clearly a hommage to the old series, does what it supposed to do. It is simple, addictive, multiplayer gets you going for a really long time (players can build custom maps!) and it is easy to drop in and out... The positive:
    +Free, no charge
    +Good multiplayer
    +Nice graphical design
    +Awesome weaponary
    +Custom maps

    The negative:
    -Not a big variety of enemies
    -Very short (when not looking at the custom maps feature)

    Both thumbs up for this title!
  18. May 26, 2011
    The game is free, runs excellent, has a decent amount of replay value, and it's really fun. If you play the game without taking friends with you, you won't enjoy it as much but it's still fun. The only real gripe I have with it is that there isn't a tutorial to explain some stuff. It isn't hard to pick up but knowing the details of stats, guns, some of the game options when creating the game, and other misc. stuff helps a little bit. I think this game really shines when you are playing with friends. It is kind of like playing L4D with or without friends.

    All in all, I'd recommend this game because it is free and chances are likely that you will like this game.
  19. Jul 22, 2011
    Alien swarm is, for a free game, is really well produced. Graphics are adapted, game play is easy to understand, and a great particularity is the non-human shape of aliens, which really is a plus in the game.

    There is no maps enough, but hopefully they can be created by players, which make this game complete, and really fun to play.
  20. Jul 23, 2011
    Pretty cool game, since its free there is no reason why you shouldnt try it. Only thing that pisses me off is the amount of peeple who have no idea how to play, and usualy go leeroy jenkins style instead of co-operating, but thats problem with the people and not the game, try to get a friend to play with you and you should be ok.
  21. Aug 10, 2011
    This game is free, and it's made by Valve. Those 2 are reason enough to get it. Anyone who gives it a bad rating because of some minor bugs should think again. Since it is free, you have to compare it to other free games. You can't compare it with a paid game, since that would be unfair. Since this game is all about coop, don't blame someone else for your bad ping, and complaining about friendly fire is stupid, because that only happens if you are playing with noobs or trolls. The only slight downside is that there is only 1 official campaign with 7 maps, but that is okay, since they have a lot of replay value. (For example, trying to get a speed run or playing on a higher difficulty, as the difficulties range from easy to brutal.)
    Overall, being a free game, it gets a 10 out of 10 from me, since there are very few free games that can match this.

    PS: Don't complain about Steam, it's the best network once you learn how to use it. All the "unnecessary" regulations are to prevent spammers, and some can be disabled if you don't like them.
  22. Sep 9, 2011
    Alien Swarm is a delightful game, especially being free. I remember when this was originally a mod for UT2004, back then it was extremely difficult. Now it's significantly more player friendly. Though not nearly as many players are online now, it is a great way to make friends. After beating the campaign the speed-runs are a wonderful way to draw that friendship even tighter as they require nearly perfect coordination amongst players. The game is dreadfully short, but that's perfect, because it honestly left me wanting more, which is the sign of a good game. With server's so empty now, the worst thing about the game is that host lag will kick your butt. Seriously, everyone should have this game installed, for those nights when you don't want to pay any money, but want to play a great game. Expand
  23. Dec 25, 2011
    I liked the game, it was a long enough game to really sink some time into, while at the same time there was enough content in the game to unlock to keep it fresh, as well as give you goals to look for. the unlock-able content helped to make the game worth multiple playthroughs, and hey, even if it was awful, which it wasn't, you can't beat free.
  24. Jan 17, 2012
    This game has beautiful graphics / sounds pretty good and flashy (Use the Source Engine), promotes the game to continue playing with a system of rewards (Exp, Lev, Weapons, etc.) and Steam achievements. At the same time also to encourage replayability of these maps have a system that changes the location of the items and the spawn of vermin or other factors, to make each game different from above. This very well optimized for the online and singleplayer. The CO-OP of the game is very good and very well done this is really interesting as they all depend on everyone. The only downside is that not much variety of maps (only 6 missions in a campaign), but the good thing is that you can add other mods using. And not forgetting the most important thing of this game, which is free, therefore it is extremely advisable to play it. Expand
  25. Apr 28, 2012
    Again, fantastic visuals from Valve. The gameplay is very, very fun (even more so with real players)

    It's free. So you can't complain. Infact, I don't see why you'd complain at all. I see nothing wrong with Alien Swarm (well, other than when you join a match you get the usual high-level snob with their remarks on how low your level is, so therefore you must be a bad player)

    That's not
    Valve's fault. Expand
  26. Jun 18, 2012
    This is a very good and fun game to play with your friends! Heavily inspired by the 2nd Aliens movie, it takes all the best from that sci-fi Aliens-like lore. The execution of the game's storyline is nice and of the gameplay elements just brilliant, powered by the Source engine. It plays as a top-down view 4-player co-op tactical shooter. There are 4 well designed classes of marines, each with its strengths and weaknesses: Sarge, Weapons Specialist, Tech and Medic. You'll need each of them, so the game inuitively encourages the co-op of 4 friends and is at its best in that. As you play and work together you will feel engaged and rewarded for cooperating and coordinating with each other. The campaign has a good pace with multiple missions and a nice variety of objectives and situations, like those you would expect from the Aliens series. Before each mission there's a briefing screen when you can review the map and objectives and select the best gear for it. There's also lots of weapons and items to unlock as you level up. There are some really nice touches, like being able to draw on the mission map with your mouse, either in the briefing or during missions, to help plan and coordinate strategies, or reviewing your performance after a mission with different charts and an animation of the teams progress on the map. Connecting your friends together in the same game is effortless via the main menu. It lets you create public or friend-only games and lists friends playing and friend-created games available, which you can join with a click - no dedicated servers needed nor ip details. The only downsides I found are that the in-game voice chat support had some noise and that there is only one official campaign. But you can always use skype for voice chat and there are more fantastic fan-made maps and campaigns, like for instance the MapPack 1.2 which you can easily find. All in all, an amazing free to play game with lots of fun to be had especially in a group of 4 friends. Expand
  27. Jul 17, 2012
    A wonderful, fast-paced action shooter. Spent a total of 45 hours playing the game, sure, the number of missions is small, but their fun, and can be played over and over. Don't bother with easy difficulty - real men start with normal right away, and eventually climb to Insane, and those who have the guts - Brutal (which I passed only once from start to finish. Something of the negative - flamethrower is the most viable weapon on higher difficulties, often incompetent team members, and the fact that so few people want to play medic that I'm probably one of the best medics around in the game now. Regardless, the game is free, and and you should make the most of it. You will not be disappointed. Expand
  28. Feb 20, 2013
    I remember "Alien Swarm" being announced the day before it's release. "Where is the next Half-life" question still makes gamers nervous, but back then it seemed like a big joke to release a game that nobody was expecting. Yet Valve never disappointed me, this time was not an exclusion. "Alien Swarm" is 3rd person action shooter that may be called a clone of "Alien Breed". Frankly speaking, I would never pick up a game like that if it was not a product of such company as Valve. But it would worth any dollar.
    All levels of the game could be completed in less than an hour. But co-op experience and dynamic generating of alien hordes make each try a unique experience. Smart achievements, all of them I managed to unlock, added some more sense in replaying "Alien Swarm"
    The fact that the game is free of charge, makes me love it even more Needless to say, after release there were couple updates and that was all. The game was not supported any further by Valve, even developers never remembered it in any interview (it seems, everybody's mind is kept on HL, CS, TF, L4D and Portal). Try it, it is worth spending an evening on it.
  29. Mar 9, 2013
    A very good game the perspective from which you view your characters is great. Although, there aren't very many players playing this game you can easily play with 3 of your friends on your own dedicated server
  30. Jan 28, 2014
    The game shows you HD resolutioned graphics with online and offline co-op game mods.The game is wide view thirdperson but you can use firstperson using some console commands.Also On Steam Greenlit "Alien Swarm First Person now available to release. The Game supports customizable GUI like other Valve games (maps, huds etc).You should not spend your time reading more comments about game. Download it and play game! Expand

Generally favorable reviews - based on 11 Critics

Critic score distribution:
  1. Positive: 8 out of 11
  2. Negative: 0 out of 11
  1. Addictive. Fun. Community driven. Free. Where can it go wrong?
  2. Simply put, anyone with a capable PC should download this and try it.
  3. Despite the issues of repetition and somewhat contrary design choices, Alien Swarm is an enjoyable shooter at an absolute steal of a non-price.