Undertale is an independent role-playing game created by Toby Fox and released in 2015. Its retro presentation, expressive characters, and distinctive audio helped inspire a large community of fan videos, animations, remixes, and gameplay edits. The label “flicker” describes the clip’s rapid, flash-like quality rather than a spoken line or musical theme. Short Undertale effects remain useful online because they fit precise frame-level edits and instantly suggest pixel-art interfaces, abrupt state changes, and the game’s occasionally unsettling atmosphere.