Alien Swarm is a game created by Valve – mostly by people who were hired from the mod community.
The game will be absolutely free! You will have to kill thousands of alien scum with your friends in order to complete the game – the game has 4 player co-op. You will be able to unlock a lot of new weapons and loadout configurations.
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
Make sure you get it as soon as it comes out tomorrow :-)

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