This sound comes from Clash Royale, the mobile strategy game released by Supercell in 2016. Players recognize it as the brief audio cue tied to launching the app, which helped it spread in gameplay clips, memes and nostalgic edits across short-form video platforms. It remains popular because the game has a huge player base and the startup sound instantly tells viewers what the clip is about before any gameplay appears. That makes it a handy cue for intros, ranked-match jokes and mobile gaming throwbacks.