Undertale 10th AnniversaryNew tab

Loads from ut10-battle.undertale.com when you press play.

Role-playing (RPG) · Browser game

Undertale 10th Anniversary

Released September 21, 2025 (last year) · by tobyfox

Runs in any browser — no download, works on Chromebook

About Undertale 10th Anniversary

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

Screenshots and video

Tags and modes

Languages

English

Undertale 10th Anniversary: questions and answers

Can I play Undertale 10th Anniversary in my browser?: Yes. Undertale 10th Anniversary runs right on this page — press Play at the top. There is nothing to download or install, and it works in any modern browser, Chromebooks included.
Who made Undertale 10th Anniversary?: Undertale 10th Anniversary was made by tobyfox and came out in 2025.
What games are like Undertale 10th Anniversary?: If you like Undertale 10th Anniversary, try Die in the Dungeon: Classic, Dark Valiance and Luckier. There is a longer list on the “Games like Undertale 10th Anniversary” page.

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