Windows

Left 4 Dead

Trivia

One of the game's achievements, "Zombie Genocidest", asks the player to kill a total of 53,595 infected. This is a reference to the "Zombie Genocider" achievement in Dead Rising, which asks the player to kill 53,594 zombies. The Crash Course download campaign even adds a new achievement, "The Littlest Genocide", which tasks the player with killing 5,359 zombies on that particular campaign.

Left 4 Dead won the multiplayer game award at the GAME British Academy Video Games Awards 2009.

Left 4 Dead recycles a lot of content from previous Valve games. Examples:

• The sound indicating an incoming horde is from the "On a Rail" chapter of Half-Life.
• Various weapon sounds are taken from similarly functioning weapons in Team Fortress 2 and Half-Life: Counter-Strike.
• The gas can looks and functions like the way it did in Half-Life 2, with the exception that Half-Life 2's gas can didn't ignite the environment around it, only enemies.
• Map props from assorted Counter-Strike: Source maps can easily be spot .
• The Tank moves just like the way D0g does in Half-Life 2.

The Japanese cover art for the game is slightly censored.

In the Windows version, the hand's thumb (which is severed in the original cover art) is covered by a small label which says "Best of E3" on it. And in the XBox 360 version, the thumb isn't missing, it's simply held down, hidden under the palm.

The German cover art for the game is also censored, as it usually is over there. However, the uncensored cover art can be found underneath the outer paper slipcover.

Funnily enough, the Japanese PC version of the game is unrated. It does not have a CERO rating (unlike the XBox 360 version, which was rated Z, equivalent to the ESRB's Mature / Adults Only ratings, PEGI's 18+ rating, and the OLFC's 15+ rating).