1x1x1x1 comes from Forsaken, the Roblox asymmetrical horror game where survivors face a rotating cast of killers. The character draws on a long-running Roblox urban legend about a mysterious hacked account, which gave the name instant recognition among Roblox players. Clips of his appearances spread through gameplay videos, edits and soundboards, where the short tense audio became shorthand for danger arriving. It remains popular because it signals a threat immediately, even in a clip only a few seconds long, without needing any explanation.