If you don't want to install an APK, some web-based tools work surprisingly well in Chrome or Firefox on Android: Undertale Battle Simulator Websites like Gaston Kar's Simulator allow you to test basic mechanics. Scratch (MIT):
are filled with Android-compatible Undertale fan games. Download them, see how they handled the UI, and use that as inspiration for your own maker journey. undertale battle maker android
Stick to the original Undertale resolution (320x240 or 640x480) to keep that authentic pixel-art feel and ensure the game runs smoothly on mobile hardware. Join the Community: Don't start from scratch! Sites like If you don't want to install an APK,