Mettaton - Ex Battle Simulator

Toby Fox, the creator of Undertale , has a relaxed stance on fan games and non-commercial simulators. As long as the simulator does not contain ripped audio files (WAVs/MP3s from the game) or use official sprite sheets without credit, it falls under fair use/fan art protection.

The is more than just a coding project; it is a testament to how memorable Undertale ’s boss design truly is. Whether you are a speedrunner shaving milliseconds off your time, a casual fan who just wants to hear "Death by Glamour" again, or a modder building a new universe, these simulators offer a perfect, low-friction way to engage with the robot celebrity. mettaton ex battle simulator