Left 4 Dead 补丁放出，Xbox360版稍后提供

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