Project Sekai: Colorful Stage! is a Japanese rhythm game featuring Hatsune Miku and original virtual singer groups, first released in 2020. Flick notes are one of its core chart mechanics, requiring a swipe in any direction as the note reaches the judgement line, with the best timing producing this critical variant. Clips of high-level play spread through YouTube, TikTok and rhythm game communities, and the isolated flick sound was later shared on soundboards as a short reaction and editing effect for swipes and perfect hits.