Piano Step

I made Piano Step after a friend asked for a piano practice app. I used AI assistance for development and preparing this introduction. It pairs numbered scores and staff notation with touch keys on an Android screen. You can practice one hand or both hands, use free play, slow the tempo and loop a section. The library contains 115 pieces, including 90 cinematic piano arrangements based on original music released under CC0: 30 beginner, 30 intermediate and 30 advanced. Sources and licenses are listed in the app. These are not famous commercial soundtrack themes or a classical collection. Import MusicXML, or create an editable draft from a PDF or score image. Check the converted notes before saving. The interface supports Korean and English. Microphone recognition and MIDI connections are not supported. Installation and basic practice are free with ads. Adults can optionally buy one-time ad removal, based at USD 1.00 with local prices shown by Google Play; no subscription. Distribution is currently Google Play only. If you try a short piece, is it clear how the numbered score matches the touch keys? I would welcome specific feedback on any confusing controls.