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.

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About Swarm Director 2 with 2 comments by BenLubar on Jul 7th, 2014

If you play an Alien Swarm map, you see something like this:

In-game view of Area 9800 Landing Zone

If you're a mapper, you see something like this:

However, if you're an alien or a marine bot, you see something like this:

Node graph from Area 9800 Landing Zone

Today, I'll explain the third view. The one you don't see unless you're actually part of the game. The little yellow boxes (nodes) tell the AI "you can go here". The game automatically connects nearby nodes to form a node graph. It's like a street map, but there are no houses and streets can appear and disappear at any time if something blocks a path between nodes.

Hammer view of Area 9800 Landing Zone without propsHammer view of Area 9800 Landing Zone with props

On the left is a room with the props removed. On the right is the same picture, but with the props. Open them in tabs and flip back and forth a few times if you can't connect them in your head.

There are two main problems with this layout: there are no hints for marine bots and some of the nodes are inside obstacles. For example, the forklift, dumpster, crates, and shelves are on top of some of the nodes. Those nodes are effectively nonexistent because they're always blocked.

Hammer view of Area 9800 Landing Zone without propsHammer view of Area 9800 Landing Zone with props

In this picture, the marines have places to stand and the nodes aren't blocked by obstacles. Since the marines aren't allowed under the shelves or past the forklift, there are no positioning hints on the right. If there were, the marines could choose to stand there and try to walk where they can't. This is an example of a good layout for AI nodes.

In a game like Swarm Director 2 that depends heavily on AI, a good node graph is very important.

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Reactive Drop 1.10
Alien Swarm

Reactive Drop 1.10

Oct 8, 2014 Alien Swarm: Reactive Drop Full Version 0 comments

New weapons, bug fixes, map fixes, jump_jet_trigger for mappers etc. Extract to <path to steam>\SteamApps\sourcemods. Restart Steam

v1 Full
Alien Swarm

v1 Full

Jul 4, 2014 Swarm Director 2 Full Version 2 comments

The first release of Swarm Director 2! Adds navmesh support, several community campaigns, better marine AI, a more powerful AI director, and a new game...

Reactive Drop 1.09
Alien Swarm

Reactive Drop 1.09

Jun 21, 2014 Alien Swarm: Reactive Drop Full Version 1 comment

Full 1.09 version. Recommended for those who didn't have Reactive Drop installed. Extract to <path to steam>\SteamApps\sourcemods. Restart Steam

Patch 1.08 to 1.09
Alien Swarm

Patch 1.08 to 1.09

Jun 21, 2014 Alien Swarm: Reactive Drop Patch 0 comments

Extract this patch on top of 1.08 version. Added support for 7 bot marines. Added displaying of 7 marines in lobby screen.

Lambda Wars 2.3.6 FULL EXE
Alien Swarm

Lambda Wars 2.3.6 FULL EXE

Jun 9, 2014 Lambda Wars Full Version 12 comments

Install Instructions: 1. Run the Installer and follow the instructions. 2. Restart steam. 3. "Lambda Wars" should now appear in your games list. If you...

Lambda Wars 2.3.6 FULL 7z
Alien Swarm

Lambda Wars 2.3.6 FULL 7z

Jun 9, 2014 Lambda Wars Full Version 2 comments

Install Instructions: 1. Extract contents into your sourcemods folder (default location: C:\Program Files (x86)\steam\steamapps\sourcemods). 2. Restart...

Post comment Comments  (0 - 10 of 184)
Guest1982
Guest1982 Oct 20 2013, 3:40pm says:

Man, I need to download and play this game :)

+1 vote     reply to comment
Guest
Guest Dec 3 2013, 12:57pm replied:

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kakkin
kakkin Sep 24 2012, 7:45pm says:

Como diablos pongo Desura en Español????? How do you go again Desura in Spanish???

0 votes     reply to comment
EASTEDERD
EASTEDERD Aug 5 2012, 4:25pm says:

This game was fun to play when you have four friends who also like it.

+2 votes     reply to comment
babyman1
babyman1 Jun 14 2012, 11:22am says:

you guys can get this game on steam for free

+4 votes     reply to comment
PurpleGaga27
PurpleGaga27 Sep 6 2011, 1:28pm buried:

(buried)

Team Fortress 2 is now Valve's best free game ever over this Alien Swarm game.

-21 votes     reply to comment
defragen1
defragen1 Nov 1 2012, 1:59pm replied:

tf2 is todays power rangers

0 votes     reply to comment
SIR_halyavshik
SIR_halyavshik Oct 11 2011, 1:22am replied:

Alien Swarm is made by fans

+15 votes     reply to comment
azultain
azultain Jul 19 2011, 4:34pm says:

Xfire.com

Gameplay of Alien Swarm

+1 vote     reply to comment
Domo01
Domo01 Jun 8 2011, 5:38pm says:

I wish Valve would update this game :C

+12 votes     reply to comment
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Alien Swarm
Platform
Windows
Developer & Publisher
Valve
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Alienswarm.com
Release Date
Released Jul 18, 2010
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Highest Rated (4 agree) 9/10

The fact that this game is free continues to amaze me. Alien Swarm is a top down shooter that feels like futuristic Diablo II to a large degree. You fight off hordes of aliens with your friends in order to complete missions that require teamwork skill, and sometimes a little luck. The game has RPG elements – you level up and get access to new gear, there are four character classes, and multiple characters within those classes to select. This game should be a popular addition to any LAN party or…

Aug 29 2011, 12:04am by Rodman49

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