However, we can get an idea of its popularity through:
* Sales figures: Undertale has sold over 1.8 million copies across all platforms, which is a strong indicator of its success.
* Critical acclaim: The game received widespread critical praise, with many calling it a masterpiece and a unique experience.
* Community size: Undertale has a dedicated and active fanbase, with numerous online communities, fan art, and fan-made content.
* Cultural impact: The game has been featured in many videos, articles, and even educational presentations, showcasing its influence on gaming culture.
While we can't put a definitive number on it, Undertale is clearly a beloved game with a huge and passionate fanbase.