Alien Swarm cover art

Alien Swarm

2010ValvePC (Microsoft Windows)

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.

What it feels like

Eradicating alien swarms and succeeding as a coordinated squad delivers moments of hard-won victory.

Triumphant55%

What it's about

Off-world colonies and alien infestations drive the sci-fi setting and narrative framing. IAF Marines conducting tactical operations against alien threats establish a military aesthetic.

Science Fiction85%
Military & War75%

How it plays

Aiming and firing ranged weapons is the core moment-to-moment interaction of the game. Top-down perspective with omnidirectional shooting mechanics is central to combat. Four distinct IAF Marine classes define roles and loadout options fundamental to squad composition.

Gunplay90%
Twin-Stick Shooting85%
Class System75%
Loadout Customization75%
Grid Tactics Combat70%
Party Management65%
Survival Needs50%
Level Editor & UGC45%

How it looks and sounds

The entire game is presented from a top-down overhead perspective defining the visual language. Third-person camera positioning frames character and environment interaction throughout.

Top-Down90%
Third-Person60%

How it's structured

A full campaign structured around 4-player cooperative play from start to finish. Play is structured as discrete selectable missions across an overrun colony. Missions are designed as discrete, completable encounters suitable for shorter play sessions.

Co-op Campaign85%
Mission-Based70%
Short Playtime60%

Shares Top-Down, Twin-Stick Shooting, Gunplay, Science Fiction.

Both lean into Top-Down, Twin-Stick Shooting, Gunplay, Science Fiction.

Top-Down90%Twin-Stick Shooting95%Gunplay85%Science Fiction80%
Helldivers 256% match

Shares Gunplay, Science Fiction, Mission-Based, Loadout Customization.

Both lean into Gunplay, Science Fiction, Mission-Based, Loadout Customization.

Gunplay95%Science Fiction80%Mission-Based90%Loadout Customization85%

Shares Gunplay, Science Fiction, Co-op Campaign, Third-Person.

Both lean into Gunplay, Science Fiction, Co-op Campaign, Third-Person.

Gunplay92%Science Fiction85%Co-op Campaign80%Third-Person85%

See all games like Alien Swarm

Alien Shooter46% match

A lesser-known kindred — Top-Down, Gunplay, Science Fiction, Twin-Stick Shooting. 95% positive across 4,694 Steam reviews.

Both lean into Top-Down, Gunplay, Science Fiction, Twin-Stick Shooting.

Top-Down95%Gunplay90%Science Fiction85%Twin-Stick Shooting75%

A lesser-known kindred — Science Fiction, Top-Down, Grid Tactics Combat, Mission-Based. 87% positive across 4,686 Steam reviews.

Both lean into Science Fiction, Top-Down, Grid Tactics Combat, Mission-Based.

Science Fiction80%Top-Down75%Grid Tactics Combat75%Mission-Based70%

A lesser-known kindred — Gunplay, Military & War, Class System, Third-Person. 96% positive across 4,671 Steam reviews.

Both lean into Gunplay, Military & War, Class System, Third-Person.

Gunplay85%Military & War65%Class System60%Third-Person70%
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