By: PixelPop Insights
When Toby Fox released Undertale in 2015, he didn’t just create a game; he created a cultural phenomenon. From the emotion-dodging mechanics of the Mercy system to the quirky, bullet-hell patterns of Flowey and Sans, fans have been obsessed with recreating that magic. For years, if you wanted to design your own “Attack” patterns or boss fights, you needed a PC, coding knowledge (GameMaker: Studio), or complex modding tools.
That era is over.
Enter the world of Undertale Battle Maker Android—a suite of mobile applications that put the power of the Underground directly into your pocket. Whether you want to fight Sans on a bus or design a unique OC (Original Character) boss fight to share with friends, this guide covers everything you need to know.
This is where the "Maker" part shines. On a touch screen, you drag and drop "Bullet Objects" onto a timeline.
Pro Tip for Android: Because the screen is small, avoid "bullet hell" clutter. Undertale works best when patterns are readable. Use the pinch-to-zoom feature (if supported) to fine-tune collision boxes.
If you only care about the story/text box aspect and not the dodging gameplay: