Undertale Full New! — Quackprep

: Widely regarded as one of the best and most complete Undertale fan games, it took a dedicated team of fans around seven years to develop.

When playing on emulator-based sites like Quackprep, the default console controls are mapped directly to your keyboard: Keyboard Key Arrow Keys / WASD Confirm / Interact Z Key / Enter Cancel / Menu Back X Key / Shift Open Menu / Inventory C Key / Ctrl Exploring the Three Main Story Paths quackprep undertale full

In this full playthrough, QuackPrep will explore the underground world, battle fierce monsters, and make tough decisions that will impact the story. Will QuackPrep choose to kill or spare the monsters? Will they uncover the secrets of the underground world? Watch to find out! : Widely regarded as one of the best

The default experience for first-time players. If you accidentally or intentionally defeat some monsters but spare others, the ending shifts based on who survives. This run is required at least once to unlock the criteria for the True Pacifist path. The Genocide (No Mercy) Run Will they uncover the secrets of the underground world

Based on archived forum posts (from Reddit’s r/Undertale, deleted Tumblr threads, and YouTube comments), a user named 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.

Another possibility is that "quackprep" could be a misspelling or variation of something else entirely. Some Undertale AUs involve alternative spellings or creative naming conventions, but no evidence currently links the specific name to any known project.