Undertale, released in 2015 by Toby Fox, introduced the Gaster Blaster as the skull-shaped cannon used in Sans's fight, named for the vanished royal scientist W. D. Gaster. Its original firing sound became iconic among fans, appearing in remixes, animations and fan games. Playing effects backwards is a long-standing editing trick online, and this reversed version spread through soundboards and meme edits because it preserves the recognisable timbre while reversing the attack's energy, making it perfect for build-ups rather than impacts.
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The reversed Gaster Blaster firing sound from Undertale, a warped rising laser blast used for creepy edits, boss moments and sudden power reveals.
This is the Gaster Blaster attack sound from Undertale played in reverse, turning its familiar descending laser charge into a strange rising sweep. Instead of firing forward, the tone seems to suck backwards, building tension before snapping off abruptly. The reversal makes the already unsettling skull cannon feel even more glitchy and wrong, which fits Gaster's mysterious presence in the game. Creators use that uneasy build-up to signal something powerful approaching, a timeline breaking, or a joke about to land with unexpected force. It is short, sharp, and instantly recognisable to Undertale fans.
