First, a necessary confession: “Quackprep” is not an official term, character, or location within Undertale. It does not appear in the game’s code, nor in any official merchandise. Instead, “Quackprep” is a folkloric internet handle—most likely the username of a now-obscure content creator from the mid-to-late 2010s.
Based on archived forum posts (from Reddit’s r/Undertale, deleted Tumblr threads, and YouTube comments), a user named Quackprep or QuackPrep was active in the Undertale fan community around 2016–2018. Their claim to fame was a series of unedited, “full” game playthroughs, often with specific constraints: no commentary, no deaths, “true pacifist” runs, or, conversely, “genocide speedruns” with developer commentary disabled. quackprep undertale full
However, the phrase “Quackprep Undertale Full” gained a secondary, more mythical meaning. Quackprep was rumored to have uploaded a complete, uncut, 6+ hour video of Undertale that contained anomalous glitches—things that shouldn’t exist in the base game. Viewers claimed to see: QuackPrep Undertale Full: A Case Study in Lost
These claims were never substantiated. Most likely, the original Quackprep videos were simple, clean playthroughs. But the internet, ever hungry for creepypasta, transformed them into a vessel for Undertale’s most potent narrative: the idea that the game is haunted by its own cut content. Gaster followers appearing in non-Gaster rooms
A spirited, community-driven reimagining of Undertale as a comprehensive, playable “prep” experience that blends study-guide pacing, rhythm-based mechanics, and fanmade narrative branches—aimed at both newcomers who want an accessible walkthrough-like playthrough and longtime fans seeking fresh challenges and comedy riffing on the original.
QuackPrep’s main channel features edited content. For "full" versions, you need to look at:
quackprep undertale full live or quackprep undertale vod."QuackPrep" "Undertale" "full stream" -clips -highlights. The minus sign removes the edited versions.