Always press the green flag before playing, otherwise it won't work properly All of the natural keys have labels on them, however here are the controls for the sharps and flats on the piano: C#/D♭ - 2 D#/E♭ - 3 mobile buttons F#/G♭ - 5 or 7 G#/A♭ - 8 A# / B♭ - 9 Scratch Cat is the Metronome. Use the BPM Slider to change the rhythm. If the piano is too loud, change the volume.