: Tools like the Undertale Engine by jevilhumor provide a framework for Game Maker Studio 2, which can then be used to compile APKs for Android.
: You can upload your creations to the Battletale website or download over 800 custom bosses made by other players.
While some apps like BattleTale provide a simplified in-app editor, more advanced creators often use cross-platform engines to build "fangames" that can be exported to Android.
: It includes "Endless Soul Mode" and weekly boss challenges featuring characters like Gaster and various AU guards.
: Use spawners that trigger projectiles based on a timer (an array that increments per frame) to create the signature "bullet hell" experience. BattleTale:Boss Battles&Maker - Apps on Google Play
: Developed by Sukirii, this is a popular action-packed simulator specifically for Android that focuses on the thrill of the original battle system. How to Create Your Own Battles on Android
: You can upload your own OCs (Original Characters) and maps to build entire new AUs.
There are two primary ways to engage with Undertale battles on Android: using dedicated or using scene creation apps for storytelling.
: It includes a "Movie Maker" for stop-motion animation and a "Dialog Creation" tool with all official UT fonts and character voices.
: On mobile, developers often choose between a virtual D-pad or a joystick style. Experts recommend using "hard limits" for the battle box (e.g., Player.y = min(battleCeiling, Player.y) ) to ensure the SOUL cannot leave the arena.