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Undertale 10th Anniversary cover

Undertale 10th Anniversary 2025

Role-playing (RPG) by tobyfox, published by tobyfox.

Web browser Role-playing (RPG) Indie Arcade

About

Two fights that were featured in the UNDERTALE 10th Anniversary event, released after the event.

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Media

Undertale 10th Anniversary screenshot

Releases

Platform
Date
September 21, 2025

Earliest full release on each platform; regional dates can differ.