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Community-created browser versions or "unblocked" mirrors that allow for basic gameplay without a local installation. quackprep undertale
Other AU (Alternate Universe) games and "bullet hell" simulators that replicate the game’s unique combat mechanics. Games Unblock QuackPrep
A highly acclaimed fan-made prequel that follows the journey of Clover, a human who falls into the Underground before the events of the original game. such as duck.quackprep.org