Creating your own bullet-hell challenges on the go has never been easier. Whether you want to recreate the legendary Sans fight or build an entirely new Alternate Universe (AU) from scratch, several tools allow you to design, play, and share battles directly on your mobile device. Top Apps for Creating Battles on Android
Use web-based editors:
Collision and Movement: 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. undertale battle maker android