Left 4 Dead is a cooperative first-person shooter released by Valve in 2008, in which four survivors fight through zombie-infested levels to reach safe rooms. Its tense audio design became part of its identity, and short clips from the game have long circulated on soundboards, in gameplay videos and in meme edits. This numbered clip is one of many user-uploaded extracts, valued less for a single famous moment than for its instantly recognisable game atmosphere, which helps creators signal danger, urgency or a horror mood in seconds.