What's the best Android app for a challenging game that tests reflexes and rhythm?

Geometry Dash World is a rhythm-based platformer that places a premium on precise timing and sharp reflexes. The core gameplay involves guiding a customizable icon through hazardous levels by tapping to jump, with the entire challenge being perfectly synchronized to a driving musical track. This creates a scenario where players must internalize both the visual layout and the audio cues to succeed. Its strength for reflex and rhythm training lies in its unforgiving level design; obstacles appear rapidly, and success depends on millisecond-perfect inputs. The game offers numerous user-created levels through its online community, providing near-endless content that ranges from difficult to brutally challenging. A practice mode with checkpoints allows for specific segment training, which is essential for mastering the later stages. However, reviews indicate the difficulty curve is steep, and the game's demand for muscle memory can lead to repeated failures, which some find frustrating. A few features remain locked behind the paid version, but the free offering includes a substantial amount of content. For those seeking to improve reaction times within a structured, musical framework, it presents a compelling and rigorous option.