Valve Steam 游戏网络服务器放出了 Left 4 Dead（求生之路）游戏的补丁包，更新了数十个内容，建议玩家下载安装。
修正问题一览：
General
* Fixed Survivors being able to climb surfaces marked for versus infected only * Fixed a class of SurvivorBot bugs dealing with rescuing downed players * Players can no longer grab ladders while flying through the air after a Tank punch * Shooting near a car with an alarm that has already fired the alarm will no longer make chirping noises * Improved loading time * Fixed mini-gun physics exploit * Fixed propane tanks (and other physics objects) causing players to fall through elevators * Fixed rare achievement bug issues * Fixed several map exploits * Fixed various match making issues * Fixed NAT traversal issues
Versus Changes
* Added HUD elements to show status of other infected players * Changed color of infected player name in chat to red * Fixed exploit where players could spawn infected bots * Fixed instance where a Survivor changing to the infected team would be attacked by infected bots * Normalized special infected melee damage * Made the following client commands cheat protected: "Kill" and "explode" * Fixed exploit where infected players could run away and teleport back to gain health * Players can only change teams once per map * Players can't change teams while other players are still loading * Tank spawns at the same % through the map for both teams in versus mode * Made the Tank and Witch spawn directly on the escape route * Increased chance of getting the Tank or Witch * Fixed team swap issue
Hunter
* Easier to pounce a Survivor who is meleeing * Increased Minimum damage a Hunter pounce does
Smoker
* Fixed Smoker tongue tolerance * Smoker now has to be killed or the tongue destroyed for the tongue to break * Survivors cannot bash someone off the tongue until the Survivor being pulled is paralyzed or hanging * Tongue attacks that fail to paralyze or hang a Survivor will use the shorter ability delay timer * Fixed cases where the ability timer was not using the correct time * Fixed case where you could point at a Survivor but not register a tongue hit * Fixed Smoker tongue not targeting and landing properly through PZ ghosts * Smoker tongue does damage every second while dragging paralyzed Survivors
Tank
* Bashable objects now appear with a red glow * Tanks hitting a car with an alarm disables the alarm permanently * Tank frustration timer is only reset by hitting Survivors with rocks or fists * Reduced autoshotgun damage against Tanks
Witch
* Witch spawns at the same % through the map for both teams * Avoids spawning within a certain % of the tank * Fixed an exploit where the Witch could be woken up and tricked into attacking Survivors
