: The "Quack Prep" name is designed to look like an educational or test-preparation site (similar to sites like SAT or ACT prep) to avoid detection by school IT administrators. Compatibility : It is frequently used on Chromebooks
: These sites are unofficial mirrors and typically violate copyrights held by Toby Fox, as they distribute the game for free. Official versions of are available on platforms like for around $10. quack prep undertale
, the site provides a way for users to play the game—or fan-made adaptations of it—directly in a web browser, often to bypass network filters in restricted environments like schools. Usage in the Undertale Community : The "Quack Prep" name is designed to