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Alien Swarm

Alien Swarm Game Cover
89%Game Brain Score
story, gameplay
stability, grinding
95% User Score Based on 10,241 reviews
Critic Score 60%Based on 1 reviews

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PCWindows
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Alien Swarm Game Cover

About

Alien Swarm is a single player and multiplayer survival shooter game with warfare and science fiction themes. It was developed by Valve and was released on July 19, 2010. It received neutral reviews from critics and very positive reviews from players.

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 coun…

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Alien Swarm screenshot
Alien Swarm screenshot
Alien Swarm screenshot
Alien Swarm screenshot
Alien Swarm screenshot
Alien Swarm screenshot
Alien Swarm screenshot
Alien Swarm screenshot
Alien Swarm screenshot
Alien Swarm screenshot
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95%
Audience ScoreBased on 10,241 reviews
story112 positive mentions
stability20 negative mentions
  • Engaging tactical, fast-paced, and cooperative team-based gameplay with varied classes and smooth controls.
  • Strong, immersive atmosphere enhanced by dynamic lighting, sound design, and intense sci-fi themes.
  • High replayability through multiple difficulty tiers, unlockable weapons, mod support, and community-created maps despite a short official campaign.
  • Limited official content and repetitive missions lead to grindy and monotonous gameplay after extended play.
  • Thin, minimalistic storyline with little narrative depth and occasionally clunky controls.
  • Technical issues on modern systems including glitches, occasional crashes, lack of recent updates, and a mostly inactive multiplayer community.
  • story
    550 mentions Positive Neutral Negative

    The story in Alien Swarm is minimalistic and primarily serves as a backdrop for the cooperative tactical gameplay, featuring a simple sci-fi premise of space marines fighting alien infestations. While the campaign consists of only a short series of missions with limited narrative depth, the atmosphere, mission design, and teamwork requirements provide engaging context. Many players find the story forgettable but enjoy creating their own interpretations or are drawn more to the gameplay experience than narrative complexity.

    • “You can also navigate through character bios and mission story.”
    • “You are a member of a team of space troopers who are investigating the circumstances of a seemingly abandoned/evacuated space colony, and trying to recover whatever data is still available.”
    • “Alien swarm is a great game; challenging difficulties, multiple, unique roles, many different weapons, realistic missions, storyline, and dialogue.”
    • “Unfortunately, it has always felt more like someone's side project than a real valve game seeing as how there is a single campaign consisting of six missions, barely tied together by a thin veneer of a story, Left 4 Dead style, and the game has never received much support since release.”
    • “This game's horrible; it is a repeating cycle of doing the same missions over and over until you get bored. The game has no originality of its own whatsoever. It is extremely boring as time passes and there is simply nothing else to make this game at least somewhat fun.”
    • “The overall storyline is pretty thin and not very compelling, but, thankfully, skipping through it won't impede your enjoyment of the game.”
  • gameplay
    436 mentions Positive Neutral Negative

    The gameplay is widely praised for its tactical, fast-paced, and cooperative team-based mechanics, where every class plays a crucial role in surviving intense alien waves. It features smooth controls, a variety of weapons and character abilities, and significant replayability despite a limited official campaign, with custom maps extending gameplay. While some find it challenging for new players and note repetitive missions and simplified story, the core gameplay remains highly engaging, especially when played with friends.

    • “Despite being free-to-play, the game offers an impressive depth of gameplay, tightly balanced teamwork mechanics, and a significant amount of replayability for its genre.”
    • “The cooperative gameplay is the standout feature, requiring coordination and strategic thinking to overcome hordes of alien enemies.”
    • “You can kinda compare this game to Left 4 Dead in how it's structured, but it expands on that gameplay with characters with varying abilities and unlockable items that can be used in loadouts.”
    • “The community is dead and the gameplay is repetitive and it gives you next to no instructions on how to perform certain tasks.”
    • “+1 rating (now it's 5/10, it was supposed to be 2+ rating but due to the amount of times that nothing changes and gets boring after too much gameplay).”
    • “Graphics, sounds and voice acting makes this game look and feel very good, but gameplay just makes it all a bit boring.”
  • graphics
    276 mentions Positive Neutral Negative

    The graphics in this game are generally considered good and well-polished for a free, 2010-era top-down shooter, featuring clean visuals, effective lighting, and smooth performance even on modest systems. While some users find the art style plain or dated compared to modern standards, many praise its suitability to the game's atmosphere and gameplay, with few significant visual glitches. Overall, the graphics are regarded as strong for its type and age, enhancing the immersive co-op experience without demanding high-end hardware.

    • “Character design, graphics, set pieces, voice acting, and sound design all lead to a positively awesome game.”
    • “Graphics - they are polished and decent, also shiny and clean, and thankfully there are no visual issues or glitches. Post processing adds bloom, depth of field, and many effects to make the game actually look pretty!”
    • “Fortunately, Alien Swarm plays an elegant role: the background, the atmosphere, the graphics, the sound, the hit... they are almost perfect, and you will soak yourself in real-time fierce co-op action with a strong immersive experience.”
    • “The graphics design is unfortunately the usual grey trash that makes telling enemies apart from anything difficult.”
    • “Clumsy controls, terrible graphics, and a complete lack of access to multiplayer games (nobody plays this) makes this a most unenjoyable title.”
    • “I would not recommend this game to anybody; the graphics are terrible and the storyline is very difficult and you can shoot your friends. It is not very realistic because of the aliens.”
  • replayability
    129 mentions Positive Neutral Negative

    Alien Swarm offers strong replayability through challenging difficulty tiers, varied classes, weapons, and cooperative multiplayer, despite having a short base campaign and limited official content. Its replay value is enhanced by unlockables, mods, leaderboards, and community-created maps, although some find the experience repetitive after extended play. Overall, the game remains highly engaging, especially for fans of cooperative shooters seeking strategic teamwork and variety.

    • “Awesome cooperative shooter with excellent replayability.”
    • “Alien Swarm provides good replay value through increasing difficulties, collectible weapons/upgrades, and leaderboards to compete on.”
    • “Despite a single short campaign (consisting of 7 missions); multiple difficulty tiers, a Left 4 Dead-like AI 'director' setting and unlockable weapons increase the replayability on this already solid tactical top-down shooter.”
    • “Though the game is designed for replayability, the limited number of maps and enemies can make the experience feel repetitive after extended playtime.”
    • “It's a short game and doesn't have much replay value, but then again it's free.”
    • “Not much replayability but it's a lot of fun.”
  • humor
    93 mentions Positive Neutral Negative

    The humor in this game is widely praised for its hilarious co-op moments, funny alien designs, and amusing secret exploits that enhance gameplay. Players often highlight the laughter and camaraderie shared during multiplayer sessions, alongside quirky in-game achievements and playful interactions. While the solo experience is less humorous, playing with friends is consistently described as a fun, entertaining, and laughter-filled experience.

    • “Most levels have really funny secret exploits that can make the missions much faster.”
    • “When I started this game, I was friends with these 3 men... now we are brothers bonded by war. We played this on the hardest difficulty and operated like a well-oiled machine; all that bonding, fun, laughing, arguing, strategizing, and accomplishment... was free.”
    • “Alien Swarm is a super team-based game with many weapons and funny extras.”
  • atmosphere
    56 mentions Positive Neutral Negative

    The atmosphere of the game is widely praised for being intense, immersive, and often claustrophobic, enhanced by dynamic lighting, sound design, and cooperative gameplay. Many reviewers highlight its tense, creepy, and engrossing mood that significantly enriches the experience despite some criticisms of repetitive missions or clunky mechanics. Overall, its strong atmosphere is considered a key strength that elevates both single-player and multiplayer modes.

    • “Alien Swarm effectively creates a claustrophobic and intense atmosphere.”
    • “Gameplay is an absolute fun and the atmosphere that is created from game pace, music, visuals, and the story is something you might not want to miss.”
    • “Dynamic lighting allows the player to really get drawn into the ominous industrial atmosphere of the game.”
    • “Clunky movement, boring missions, zero atmosphere — and whatever tension it tries to build dies fast.”
    • “What I don’t like about this game is its gaming atmosphere, it feels very generic.”
    • “Overly simplified gameplay, repetitive mission objectives, lack of atmosphere.”
  • music
    54 mentions Positive Neutral Negative

    The game's music and sound design effectively enhance its sci-fi, suspenseful atmosphere, with an electronic soundtrack and fierce alien sound effects creating tension and immersion. Many players appreciate the option to use custom combat music, which adds a personal touch to intense moments. However, some find the in-game music limited or mediocre, noting the absence of music in menus and a lack of memorable tracks beyond sound effects.

    • “The visual style, combined with the game's eerie sound design and soundtrack, brings a sense of urgency and suspense that ramps up as you dive deeper into each mission.”
    • “The electronic soundtrack fits the sci-fi setting well and sound effects for the alien hordes are appropriately fierce.”
    • “The music and voice acting are well-done, as is the sound design.”
    • “Also, the music is not very good as sound effects are.”
    • “Alien Swarm isn't really a game with magnificent tracks; apart from the sounds from the swarms, the voices for the marines, or the music track indicating that you're going to be swarmed or under adrenaline effect, you have nothing.”
    • “No music menu, no music in the lobby leader, just random sounds.”
  • monetization
    30 mentions Positive Neutral Negative

    The game's monetization is highly praised for being completely free-to-play with no microtransactions, in-game purchases, or pay-to-win elements. Players appreciate its genuine, no-cost access combined with quality content and mod support, making it a standout free experience.

    • “Alot of value for something of no cost at all, with no microtransactions at all.”
    • “It's incredible that this game is free to play (no microtransactions), because the amount of polish and quality of content is on par with any other Valve game.”
    • “No distractions, no region locking, no microtransactions; it's just you, your gun, and hundreds of bugs.”
  • stability
    23 mentions Positive Neutral Negative

    The game's stability is mixed, with many users reporting occasional glitches, bugs, and crashes, particularly on modern devices, and some persistent technical issues due to lack of recent updates. Despite these problems, the game generally runs well, with polished graphics and stable multiplayer performance, making it still enjoyable though occasionally frustrating.

    • “Good news is that this game is way better than some of the games I have seen; it's surprisingly not buggy and not pay-to-win.”
    • “The game runs great and finding a server to play on is easy as pie.”
    • “Bug free?”
    • “Only issue I have is the glitches on modern devices and no bots to fill up the rest of the lobby in multiplayer.”
    • “Buggy game, crashes every time I run it.”
    • “Unfortunately Valve no longer has updates for the game, and because of that, there are many old glitches, bugs, and other technical issues that haven't been resolved by the developers.”
  • grinding
    22 mentions Positive Neutral Negative

    The grinding in the game is described as extensive and often tedious, with players needing to repeat levels multiple times to unlock weapons and achievements. While some enjoy the challenge and progression system, the limited content and repetitive nature make the grind feel monotonous, especially after completing the main campaign. Multiplayer adds some enjoyment, but the lack of variety and bot support can hinder the experience.

    • “You'll need a second life for grinding.”
    • “You check to see if there's any more new content and bam, it's empty—darker than pitch black, overused coal. There's no DLC, no grinding, no leaderboard. The only fun you get from this game is when you play online with friends on the same level, all of you playing over and over again.”
    • “You'll need a second life for grinding.”
    • “An early update enabled repeating the 27 levels with higher EXP requirements, but this just makes the grind to unlock weapons more grindy.”
    • “It has good mechanics and I would really like playing it some more... if there was more, because you can complete the only campaign "Jacob's Rest" quite quickly and then it's just grinding.”
    • “Going through loot is tedious when all you are doing is increasing DPS.”
  • optimization
    19 mentions Positive Neutral Negative

    The game is generally well optimized, running smoothly with minimal fps drops or lag on most systems, including low-end computers. Some users report occasional performance issues on newer hardware, such as stuttering or underutilization of resources. Overall, optimization is praised for delivering a fluid and enjoyable co-op experience.

    • “Childhood favorite glad to see it back and better optimized.”
    • “Really fun and well optimized co-op game.”
    • “Great optimization – game is really fluent with no FPS drops and minimal lag.”
    • “I get that Valve was trying to make it optimized for low-end computers but definitely not worth spending time on.”
    • “This is a very fun game, however I tried to install and play it somewhat recently and had issues on new computer, there was stuttering and it seems like the game was not using all the cores or just available resources.”
    • “Performance rating: 6 out of 10.”
  • emotional
    6 mentions Positive Neutral Negative

    The game evokes strong emotional reactions, ranging from heartwarming and touching moments to gut-wrenching intensity. Players recall lasting, profound impacts, with some expressing heartfelt nostalgia despite minor disappointments like limited content. Overall, it delivers a deeply moving experience.

    • “Eight years on I can still recall how profoundly that game gripped me, and I am not an overly emotional person.”
    • “Heartwarming and sure to put a smile on your face.”
    • “Allen's Warm is the touching story of a paraplegic man that finally gets the feeling back in his legs on Christmas.”
  • character development
    2 mentions Positive Neutral Negative

    The character development is praised for its engaging progression system, allowing players to level up and acquire improved weapons and items. Combined with strong character design, voice acting, and sound, this creates an immersive and enjoyable experience.

    • “I really like how they dealt with character development, where you can level up and achieve better weapons or items, which are a big help and fun of course.”
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60%Critics’ scoreBased on 1 critic reviews
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11h Median play time
43h Average play time
4h Main story
15h Completionist
4-50h Spent by most gamers
*Based on 25 analyzed playthroughs
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Frequently Asked Questions

Alien Swarm is a survival shooter game with warfare and science fiction themes.

Alien Swarm is available on PC and Windows.

The main story can be completed in around 4 hours, while the entire game is estimated to take about 15 hours to finish. On average players spend around 43 hours playing Alien Swarm.

Alien Swarm was released on July 19, 2010.

Alien Swarm was developed by Valve.

Alien Swarm has received neutral reviews from players and neutral reviews from critics. Most players liked this game for its story but disliked it for its stability.

Alien Swarm is a single player game with multiplayer and local co-op support.

Similar games include PAYDAY The Heist, Killing Floor, Killing Floor 2, Left 4 Dead, Aliens: Fireteam and others.