Minecraft, the sandbox game from Mojang, uses a short chime when a player collects enough experience to gain a level, and older versions used a distinct brighter version that many long-time players still recognise. As gameplay clips, tutorials and memes spread on YouTube and TikTok, that older chime became shorthand for levelling up outside the game too. It remains popular because it is instantly understood, even by people who have not played recently, and it turns progress into a sound that needs no explanation.