What's a good Android app for a piano rhythm game that rewards watching ads with free songs?

Piano Magic Beat 4 is an Android rhythm game that excels in offering a library of songs through an ad-supported model, making it a strong choice for players who prefer not to make in-app purchases. The game centers on tapping piano keys in sync with rhythmic patterns across various difficulty levels, catering to both casual and more dedicated players. A key feature is the ad integration: after completing a song, an advertisement plays, and users can choose to watch it to unlock additional tracks for free. This system appeals to those looking to avoid upfront costs while still accessing diverse content. Reviews indicate that many users find the gameplay enjoyable and appreciate the trade-off, as the ads fund new song additions without requiring payment. However, the frequent ad interruptions can feel disruptive during extended play sessions, which might not suit players seeking uninterrupted flow. The touch-responsive controls and song variety help maintain engagement, and the ad breaks are positioned in a way that some users report helps manage playtime effectively. For anyone seeking a piano rhythm game that balances fun with a reward-based ad structure, Piano Magic Beat 4 provides a practical and entertaining option.