NHK OTOPPE COLLECTION is an official app from the TV program 'OTOPPE', broadcast on NHK. This Android app is available in Japanese only and is categorized under Education & Reference. The app allows users to collect OTOPPE characters by recording sounds around them. The more characters you collect, the higher the chances are of meeting a special OTOPPE and enjoying rare sounds from all over the world.

NHK OTOPPE COLLECTION is an excellent app for those who like to collect things, especially sounds. The app is free to use, and it is easy to navigate. The app's interface is user-friendly, and it is easy to understand how to use it. The app's graphics are colorful and engaging, and the sound quality is excellent. However, the app is only available in Japanese, which may limit its accessibility to non-Japanese speakers.