Sprunki began as a fan-made mod for the music game Incredibox, where players drag icons onto characters to build looping tracks. Mr Sun is one of its original cast, and Sprunked reworks those characters and sounds into a darker horror style. Clips of the Sprunked versions spread through YouTube, TikTok and fan mod pages, where creators remix the loops, compare normal and horror phases, and build their own phases. This Mr Sun version remains popular because the familiar sunny character sounds unexpectedly unsettling.