Left 4 Dead
Release Date: 17 Nov, 2008
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From Valve (the creators of Counter-Strike, Half-Life and more) comes Left 4 Dead, a co-op action horror game for the PC and Xbox 360 that casts up to four players in an epic struggle for survival against swarming zombie hordes and terrifying mutant monsters.
Set in the immediate aftermath of the zombie apocalypse, L4D's survival co-op mode lets you blast a path through the infected in four unique “movies,” guiding your survivors across the rooftops of an abandoned metropolis, through rural ghost towns and pitch-black forests in your quest to escape a devastated Ground Zero crawling with infected enemies. Each "movie" is comprised of five large maps, and can be played by one to four human players, with an emphasis on team-based strategy and objectives.
New technology dubbed "the AI Director" is used to generate a unique gameplay experience every time you play. The Director tailors the frequency and ferocity of the zombie attacks to your performance, putting you in the middle of a fast-paced, but not overwhelming, Hollywood horror movie.

"The Sacrifice” is the new free add-on for Left 4 Dead.
"The Sacrifice" is the prequel to "The Passing," and takes place from the L4D Survivors' perspective as they make their way South. In addition to advancing the story, "The Sacrifice" introduces a new style finale featuring "Sacrificial Gameplay" where players get to decide who will give their life so the others may live.
In The Sacrifice for Left 4 Dead owners receive "The Sacrifice" campaign playable in Campaign, Versus, and Survival modes.
Set in the immediate aftermath of the zombie apocalypse, L4D's survival co-op mode lets you blast a path through the infected in four unique “movies,” guiding your survivors across the rooftops of an abandoned metropolis, through rural ghost towns and pitch-black forests in your quest to escape a devastated Ground Zero crawling with infected enemies. Each "movie" is comprised of five large maps, and can be played by one to four human players, with an emphasis on team-based strategy and objectives.
New technology dubbed "the AI Director" is used to generate a unique gameplay experience every time you play. The Director tailors the frequency and ferocity of the zombie attacks to your performance, putting you in the middle of a fast-paced, but not overwhelming, Hollywood horror movie.
- Addictive single player, co-op, and multiplayer action gameplay from the makers of Counter-Strike and Half-Life
- Versus Mode lets you compete four-on-four with friends, playing as a human trying to get rescued, or as a zombie boss monster that will stop at nothing to destroy them.
- See how long you and your friends can hold out against the infected horde in the new Survival Mode
- An advanced AI director dynamically creates intense and unique experiences every time the game is played
- 20 maps, 10 weapons and unlimited possibilities in four sprawling "movies"
- Matchmaking, stats, rankings, and awards system drive collaborative play
- Designer's Commentary allows gamers to go "behind the scenes" of the game
- Powered by Source and Steam
THE SACRIFICE

"The Sacrifice” is the new free add-on for Left 4 Dead.
"The Sacrifice" is the prequel to "The Passing," and takes place from the L4D Survivors' perspective as they make their way South. In addition to advancing the story, "The Sacrifice" introduces a new style finale featuring "Sacrificial Gameplay" where players get to decide who will give their life so the others may live.
In The Sacrifice for Left 4 Dead owners receive "The Sacrifice" campaign playable in Campaign, Versus, and Survival modes.
SYSTEM REQUIREMENTS
Windows
Minimum:
- Supported OS: Windows® 7 32/64-bit / Vista 32/64 / XP
- Processor: Pentium 4 3.0GHz
- Memory: 1 GB
- Graphics: 128 MB, Shader model 2.0, ATI 9600, NVidia 6600 or better
- Hard Drive: At least 7.5 GB of free space
- Sound Card: DirectX 9.0c compatible sound card
Recommended:
- Supported OS: Windows® 7 32/64-bit / Vista 32/64 / XP
- Processor: Intel core 2 duo 2.4GHz
- Memory: 1 GB
- Graphics: Shader model 3.0, NVidia 7600, ATI X1600 or better
Mac OS X
- OS: MacOS X 10.6.4 or higher (Snow Leopard Graphics Update required)
- Processor: Dual core Intel processor, 2GHz or better
- Video Card: ATI Radeon 2400 or higher / NVIDIA 8600M or higher / Intel HD Graphics 3000
- Not supported: OS X 10.5.x, ATI X1600 or X1900 graphics, NVIDIA GeForce 7 graphics or Intel graphics less than Intel HD 3000.
DRAG AND DROP

Rescue a Survivor from a Smoker's tongue before he takes damage.
TONGUE TWISTER

Kill a Smoker who has grabbed you with his tongue.
TANKBUSTERS

Kill a Tank without it dealing any damage to a Survivor.
BRAIN SALAD

Make 100 headshot kills.
BLIND LUCK

You or another Survivor take no damage after being vomited on by a Boomer.
PYROTECHNICIAN

Blow up 20 Infected in a single explosion.
TOWERING INFERNO

Light a Tank with a Molotov.
MY BODYGUARD

Protect any Survivor from an attacking Infected 50 times.
HERO CLOSET

Rescue a Survivor trapped in a closet.
HUNTER PUNTER

Shove a Hunter off of a pinned and helpless Survivor.
101 CREMATIONS

Set 101 Infected on fire.
NO-ONE LEFT BEHIND

Beat a campaign with all 4 Survivors.
WITCH HUNTER

Kill a Witch without any Survivor taking damage from her.
NO SMOKING SECTION

Kill 10 Smokers as they are pulling helpless Survivors.
OUTBREAK

Catch a rare strain of infection, then pass it on to someone else.
SPINAL TAP

Kill an Infected with a single blow from behind.
DEAD STOP

Punch a Hunter as he is pouncing.
BURN THE WITCH

Light a Witch with a Molotov.
MERCY KILLER

Survive the No Mercy campaign.
JUMP SHOT

Headshot a Hunter while he's leaping.
GROUND COVER

Save another Survivor from a Special Infected while on the ground.
DEAD BARON

Survive the Dead Air campaign.
TOLL COLLECTOR

Survive the Death Toll campaign.
CLEAN KILL

Shove a Boomer and then kill him without him splashing on anyone.
GRIM REAPER

Survive the Blood Harvest campaign.
CRASH-PROOF

Survive the Crash Course Campaign.
STAND TALL

Survive a campaign without being incapacitated.
BRONZE METTLE

Earn a Bronze medal in Survival mode on any official level.
DOUBLE JUMP

Pounce two different Survivors on one life as a Hunter.
DEAD GIVEAWAY

Heal a fellow Survivor when your own health is below 10.
CHAIN SMOKER

Constrict two Survivors on one life as a Smoker.
HELPING HAND

Revive 50 incapacitated Survivors.
LAST STAND

Complete one round of Survival on The Last Stand.
PHARM-ASSIST

Give pain pills to 10 Survivors.
DEAD WRECKENING

Dole out 5000 total Survivor damage as a Special Infected.
BACK 2 HELP

Leave a safe room to save an incapped teammate and bring them back safely.
SILVER BULLETS

Earn a Silver medal in Survival mode on any official level.
FIELD MEDIC

Heal 25 Survivors with a first aid kit.
LAMB 2 SLAUGHTER

As an Infected, incap a Survivor who has entered and left a safe room.
BIG DRAG

Drag a Survivor 100 feet with your tongue as a Smoker.
DO NOT DISTURB

Sneak past all Witches in a campaign without disturbing one.
VIOLENCE IS GOLDEN

Earn a Gold medal in Survival mode on any official level.
QUICK POWER

Restart the generator within 30 seconds of it shutting off.
CR0WND

Kill a Witch with a single headshot.
BARF BAGGED

Cover four Survivors with Boomer bile at once.
All 4 Dead

Kill all four Survivors on one life as a Tank.
MAN VS TANK

Single-handedly kill a Tank.
AKIMBO ASSASSIN

Survive an entire campaign using only pistols.
UNTOUCHABLES

No Survivors take damage after contacting the rescue vehicle.
TANK STUMBLE

Stun a Tank with an explosion in the Crash Course campaign.
ZOMBICIDAL MANIAC

Survive any campaign on Expert.
UNBREAKABLE

Finish a campaign without ever using a first aid kit on yourself.
STOMACH UPSET

All Survivors complete a campaign without being vomited on.
SMASH HIT

Win a Versus campaign of Crash Course.
Supreme Sacrifice

Complete "The Sacrifice".
RED MIST

Kill 1000 Infected with a mounted machine gun.
ZOMBIE GENOCIDEST

Kill 53,595 Infected.
Kill Bill

Have Bill sacrifice himself for the team.
SLIPPERY PULL

Smoker pull a bile-covered Survivor until you hold him during Crash Course.
SAFETY FIRST

Play an entire campaign with no Survivors taking friendly fire damage.
WIPEFEST

Your team incapacitates three Survivors within five seconds.
WHAT ARE YOU TRYING TO PROVE?

Survive all campaigns on Expert.
Chaos Generator

Have all 3 generators running at once in "The Sacrifice" finale.
DISTINGUISHED SURVIVOR

Earn at least a Bronze medal on every official Survival level.
THE LITTLEST GENOCIDE

Kill 5,359 Infected in the Crash Course campaign.
Barrel Rolled

Kill a Special Infected with an exploding barrel.
JUMPIN' JACK SMASH

Pounce a Survivor for 25 points of damage in the Crash Course campaign.
NOTHING SPECIAL

Survive a campaign with no Survivors taking damage from Special Infected.
HEROIC SURVIVOR

Earn at least a Silver medal on every official Survival level.
LEGENDARY SURVIVOR

Earn a Gold medal on every official Survival level.
TRUCK STOP

Your team wipes all Survivors after the escape vehicle has opened in Crash Course.
Sacrifizzle

As a Special Infected, incap someone who is trying to sacrifice themselves.
20 CAR PILE-UP

As A Tank hit 20 Survivors with a car in the Crash Course campaign.