Met Left 4 Dead 2 lanceerde Valve eind vorig jaar een vervolg op de succesvolle horror/survival game uit 2008. In de game ga je aan de slag met één van de vier hoofdpersonages en werk je jezelf een weg door horden zombies. Dit kun je alleen doen, maar ook in coöp.  
            Valve heeft recent een update uitgebracht voor de PC versie van de game die de felbegeerde bots toevoegd aan de Versus mode. Tevens werden er verschillende dingen in de game verbetert. Ook aan de community werd gedacht, het is nu mogelijk om levels te maken die gebaseerd zijn op Nintendo 64 games. De Xbox 360 moet binnenkort ook een patch krijgen die de verbeteringen zal doorvoeren. Hieronder de volledige lijst van de update. 
 
quote: Gameplay 
Now ghost PZ's can never be staggered 
Enabled PZ bots 
PZ bots use their more aggressive survival mode behavior in versus and scavenge 
Enabled finale manual spawn by default 
Fixed human PZ players not getting counted when they were dead, allowing extra PZ bots to spawn 
Reduced effectiveness of melee weapons against the Tank ( 5% of max health, from 10% ) 
Fixed a case where a player who dies, then is rescued from a rescue closet, and then is revived from a ledge hang receives the secondary weapon that he lost when he was initially killed 
Improved SurvivorBot AI in cases where the bots refused to shoot through their teammates and became non-responsive 
Fixed issue with witch sometimes taking on uncommon common properties 
Fix for cheaters quitting before the vote to kick them would succeed and avoiding ban on server 
VAC banned users can now play L4D2 single-player, commentary mode and credits 
 
Map Fixes 
Dark Carnival Fair Ground: added env_player_blocker to keep special infected from getting stuck 
Dark Carnival Fair Ground: added navigation area that was missing 
Dark Carnival Fair Ground: Disconnected drops that were blocked by the top of a fence 
Swamp Fever Plank Country: Deleted 2 nav areas that connected between tree trunks you can't pass through 
Swamp Fever Shanty Town: Redrew ladder thinner so special infected could climb up to the roof 
The Parish Waterfront: Fixed various navigation areas 
Mall: Tuned spawning for difficulty 
 
SDK Content 
Added missing nature/blend tooltextures added 
Added missing cs models/textures 
Added missing acunit01 model/texture 
Added missing ammo_can_02 model/texture 
Added missing patio_chair model/texture
  
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