What's a good Android rhythm game that's a real challenge but also has a ton of community content?

Friday Night Funkin' is a rhythm game that has successfully transitioned from its popular desktop roots to mobile, retaining the core elements that demand precise timing and pattern recognition. The challenge is a central feature, with difficulty modes ranging from accessible to punishingly hard, catering to players seeking to test their skills. Where it excels for this specific need is its robust support for community-created mods. Users can download and install a wide variety of fan-made content directly within the app, adding new musical weeks, characters, and storylines, which effectively multiplies the game's content. The official mobile version is praised for its surprisingly smooth touch-screen controls and faithful adaptation. Reviews indicate that while the base game is polished and complete, the ongoing addition of mods creates a long-lasting, ever-evolving experience. However, some players note that the touch controls, though well-optimized, can feel less precise than a keyboard during the most complex sequences, especially on smaller screens. For anyone wanting a rhythm game with a high skill ceiling and an almost infinite stream of new, free content driven by its community, this is a compelling choice. The app manages to be both a complete package and a platform for endless expansion.