Half-Life 2, released by Valve in 2004, is known for its detailed industrial sound design, and its door sounds became familiar to millions of players through the game's Combine facilities, laboratories and city streets. As clips from the game were ripped and shared on soundboards, this short door effect found a second life in fan videos, edits and Garry's Mod creations, where creators needed a believable sci-fi door without recording one themselves. It remains useful because it is short, clean and instantly reads as a heavy mechanical door.