A Steam news article listing the effects of a patch

Patches are updates to the game that fix bugs, add new features and tweak maps.

July 13, 2012 Edit

  • Added latest localization files.
  • Fixed a crash when viewing the Achievements screen in a non-English language.

July 7, 2012 Edit

  • Added shader source code.
  • Matchmaking system supports mods with more than 4 players.
  • Mods store their config.cfg separately from the base game.

April 15, 2011 Edit

  • Allow XP gain on custom maps.
  • Fixed a camera prediction bug.
  • Added .smd and .qc files for the marine and drone to the SDK

October 11, 2010 Edit

  • Added TTF font support
  • Fixed an engine exploit[1]

August 23, 2010 Edit

August 9, 2010 Edit

August 5, 2010 Edit

  • Fixed Assault Jets using up more than one charge when you have high ping
  • Fixed HLMV material loading when running a mod
  • Fixed a Steam cloud bug in the SDK source code[4]

July 30, 2010 Edit

  • Fixed XP/Level transferring to a new player using an old player's PC
  • Addon VPKs get priority over base VPKs
  • Added -override_vpk command line option to make loose files have priority over VPKs
  • Stopped spawners shutting down completely when an alien is blocking the location for more than 5 ticks in a row.[5]

July 26, 2010 Edit

  • Fixed performance issues on SynTek Residential
  • Added Dedicated Server Browser to the main menu
  • Cheat protected marine skill values.[6]

July 23, 2010 Edit

  • The Vindicator's grenade explosion effect should no longer crash users running a GTX260 graphics card.
  • Fixed a bug where marines would continue to be buffed by the Damage Amp if they were standing in it when it expired.
  • Fixed ammo usage on the Tesla Cannon to properly decrease 4 times a second instead of 2 (doubled clip size to account for this).
  • Rebalanced Tesla Cannon's damage to encourage it to be used more as a support weapon.
  • Tesla Cannon will now use ammo slowly even when it isn't damaging something.
  • Fixed Unicode text chat[7]

July 22, 2010 Patch 2 Edit

  • Matchmaking distinguishes between games in progress and games in the briefing
  • Updated Hammer's simple compile options
  • Fixed fast reload sounds and incidental marine conversations[8]

July 22, 2010 Patch 1 Edit

  • Fixed crash to desktop on certain graphics cards
  • Fixed matchmaking sending you to the wrong mission
  • Fixed not being able to earn the "Ammo Technician" achievement
  • Fixed not being able to open particle systems in the editor[9]

July 21, 2010 Edit

  • Fixed weapon switch key in the 360 controller config
  • XP and level are stored in the Steam Cloud
  • Fixed duplicate rows in the "Find Public Games" screen
  • Reduced screen shake when you have high ping
  • Fixed dedicated server always starting in LAN mode
  • Fixed custom item button binds not displaying properly on HUD
  • Fixed full network updates causing duplicate client ragdolls to spawn
  • Added console commands to change game access on the fly (make_game_public and make_game_friends_only)
  • Fixed welding icon sometimes getting stuck above player's head
  • Fixed HUD elements being cut off in ultra wide resolutions
  • Removed cheat flag from a number of cosmetic console commands
  • Now firing, meleeing, or reloading while welding will break you out of the weld
  • Fixed spectators earning achievements
  • Fixed infinite ammo exploit
  • Fixed XP exploit[10]


  1. "Alien Swarm Update Released", Valve. October 11, 2010.
  2. "Alien Swarm Adds AI Director, New Difficulty", Valve. August 23, 2010.
  3. "Alien Swarm SDK Update Released", Valve. August 9, 2010.
  4. "Alien Swarm Update Released", Valve. August 5, 2010.
  5. "Alien Swarm Update Released", Valve. July 30, 2010.
  6. "Alien Swarm Update Released", Valve. July 26, 2010.
  7. "Alien Swarm Update Released", Valve. July 23, 2010.
  8. "Alien Swarm Update Released", Valve. July 22, 2010.
  9. "Alien Swarm Update Released", Valve. July 22, 2010.
  10. "Alien Swarm Update Released", Valve. July 21, 2010.

External linksEdit

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