オトッペピアノ is a free music and educational app developed by THINKLEDGE INC. It features characters from the popular NHK Eテレ show "オトッペ" and is designed to help children learn about music through playing the piano. With a variety of modes and features, this app offers an engaging and interactive experience for young users.

The app includes a Free Play mode, where users can freely play the piano and explore different musical notes. The notes are assigned to the characters, making it easy for children to play and enjoy music even if they don't know the scales. There is also a Practice mode, which helps users familiarize themselves with the app and learn basic scales by playing them on the piano keyboard.

In the Song Play mode, users can play popular songs like the theme song "ウキウキオトッペ" and "オトッペタウンのテーマ," as well as famous children's songs such as "おおきなくりのきのしたで" and "ちょうちょう." The app provides hints for each song, making it possible for users to play even unfamiliar tunes.

Users can also listen to the demo version of the songs with the Autoplay feature, which allows them to hear the correct melody before playing. The app offers a collection card feature, where users can collect cards featuring the characters and items from the show. By completing levels and earning medals, users can fill their bingo cards and unlock additional collection cards and background materials.

With its user-friendly interface and variety of features, オトッペピアノ is a great app for children to learn and have fun with music. Please note that the app requires a network connection and is recommended for children aged 3 and above.