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2010

This DLC is a port from Left 4 Dead, adding the campaigns The Sacrifice and No Mercy. Initially, it was to be released for the first game alone, but since players would have to own Left 4 Dead to experience the events that explain The Passing, the developers opted to release it for both games. No Mercy was brought over as well because it was the most popular campaign. Both campaigns are available in every game mode. Players will still control the original Survivors, but will find items and Special Infected from Left 4 Dead 2. Five achievements were added, as in Left 4 Dead.
LIKE LAMBS TO THE SLAUGHTER
Earn a silver medal on every official survival map.
KILLING SPREE
Earn a gold medal on every official survival map.
SPITFIRE
Destroy 20 gascans as the Spitter.
A LITTLE HACK AND SLASH
Earn a bronze medal on every official survival map
THE BIG TEN
Survive for 10 minutes on any official map in Versus Survival.
Z-GENOCIDEST 2: EPISODE 2
Kill 53,599 infected. You made sure the dead won't rise anymore!
THE LAST FRONTIER
Survive The Last Stand campaign on Expert Realism.
PURE SATISFACTION
Kill 20 Jockeys with the shovel or pitchfork.
GOLDEN FREEMAN
Find the golden crowbars hidden in the Left 4 Dead 1 survival maps.
SHOTGUN WEDDING
Kill the Witch bride with a single shotgun blast on expert difficulty.
| Language | Interface | Subtitles | Full audio |
|---|---|---|---|
| Chinese (Simplified) | Supported | Supported | Not supported |
| Chinese (Traditional) | Supported | Supported | Not supported |
| Czech | Supported | Supported | Not supported |
| Danish | Supported | Supported | Not supported |
| Dutch | Supported | Supported | Not supported |
| English | Supported | Supported | Supported |
| Finnish | Supported | Supported | Not supported |
| French | Supported | Supported | Not supported |
| German | Supported | Supported | Not supported |
| Hungarian | Supported | Supported | Not supported |
| Italian | Supported | Supported | Not supported |
| Japanese | Supported | Supported | Not supported |
| Korean | Supported | Supported | Not supported |
| Norwegian | Supported | Supported | Not supported |
| Portuguese (Brazil) | Supported | Supported | Not supported |
| Portuguese (Portugal) | Supported | Supported | Not supported |
| Russian | Supported | Supported | Not supported |
| Spanish (Spain) | Supported | Supported | Not supported |
| Swedish | Supported | Supported | Not supported |
| Thai | Supported | Supported | Not supported |
| Turkish | Supported | Supported | Not supported |
| Ukrainian | Supported | Supported | Not supported |
| Vietnamese | Supported | Supported | Not supported |