UnderBattles - AU Fights has 210 thousand installs. Users are divided: 3.6 stars from 1,087 ratings. Show more ›
UnderBattles - AU Fights is made and published by
KYwoo.
AppBrain is an independent app data site and isn't affiliated with KYwoo.
The app name, icon, screenshots and description belong to KYwoo and are shown as
published on Google Play.
Pros & Cons
Diverse Undertale AU battles in a single fan-driven app
Completely free-to-play with no paywalls
Explicit IP and copyright transparency with direct contact
Ongoing development signal through the planned REMASTERED update
Not officially affiliated with Undertale or Toby Fox
Not ranked in any top list, which may affect discovery
Content quality may vary as a fan-made project
About UnderBattles - AU Fights
UnderBattles - AU Fights is a role playing app developed by KYwoo.
Install Statistics
UnderBattles - AU Fights has been downloaded 210 thousand times. In the last 30 days, the app was downloaded 10 thousand times.
User Ratings
UnderBattles - AU Fights is rated 3.65 out of 5 stars. The rating is based on 1.1 thousand ratings.
App Information
UnderBattles - AU Fights is freely available from Google Play. The APK size is 49.01 MB. The latest APK version available is 1.9. The last update was on July 18, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play since September 2024.
Description by KYwoo(from Google Play)
This is a completely free to play fan-made unofficial project based on the original Undertale™ game created by Toby Fox.
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So good game, but can you please add lust sans to the game? I've always wanted to do the anxiety sans fight aside from that, it is one of my favorite games other than undertake and delta rune.🤎🧡💛💚💙💜
★★★★★Dominic Nunez· Nov 24, 2024
It's not really a review (though this game does deserve the 5 stars as it's the best mobile undertake game, at least on the play store), definitely add more battles which I know will be added into the future. One fight I'd like to see would be sudden changes sans, as well as last breath (though that would probably take a while to add)
★☆☆☆☆Blake· Dec 27, 2024
Overall, when I install the game, random games get installed onto my phone, and the developer seems like the concept of respect is unseen, judging by these replies, other than that, good. (Add revenge the unseen ending, and I'll make this 5 star-)
★★☆☆☆KiKi Cat· Nov 11, 2025
The battles are pretty good, but they are extremely difficult to maneuver. And I like that the naming works the same as Undertake, like with Chara being the true name, and other characters' names not being allowed. HOWEVER! Gaster crashing the game is completely understandable (as it does that in Undertake & Delta rune), but River also crashes it!! IDK if it's a bug, a glitch or just some AU's rule, but please get rid of it. Thank you.
Google Play Rankings for UnderBattles - AU Fights
This app is not ranked
Technologies used by UnderBattles - AU Fights
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