Rust is the multiplayer survival game developed by Facepunch Studios, first released in early access in 2013 and fully launched in 2018. Its timed explosive charge, usually called C4, became one of its most recognisable raiding tools, used to breach doors and walls during base raids. Clips of raids spread widely on YouTube and Twitch, turning the beeping countdown into a familiar gaming cue outside the game as well, in the same family as the bomb has been planted callout from tactical shooters.