Which iOS app should I use for a music-driven platformer with varying difficulty levels?

Geometry Dash SubZero is a standalone entry in the Geometry Dash series that excels as a music-driven platformer. It features three official levels—'Press Start,' 'Nock Em,' and 'Power Trip'—each with unique electronic soundtracks that directly sync to gameplay, requiring players to navigate geometric shapes through obstacles with precise jumps. The app balances accessibility with challenge; early sections introduce mechanics gently, while later segments demand quick reflexes, catering to both newcomers and seasoned players. Specific features include a practice mode for mastering tricky sections, collectible coins for extended play, and customizable player icons. Users report that the music is particularly engaging, with reviews praising tracks as 'Spotify playlist worthy' and levels that 'caught me off guard' in a positive way. However, the app is free with occasional interstitial ads, which some might find disruptive, though feedback suggests they are generally tolerated. Additionally, unlike the main Geometry Dash title, SubZero lacks a level editor, limiting creative replayability. For real-world scenarios, such as commuting or quick gaming sessions, its bite-sized levels and responsive controls make it a reliable choice. Minor imperfections include occasional difficulty spikes that can frustrate less patient players, but overall, it provides a polished, rhythm-based experience.