Click the green flag to start. Press the space key to change the background. Press the keys for the sound. I'd recommend you play by pressing the piano keys though. The red letters and numbers are the keys you need to press for the sound.
For computer users: Press C for key C, press D for key D, press E for key E, press F for key F, press G for key G, press A for key A, press B for key B, press up-arrow for key C 2, press down-arrow for key D 2, press 1 for C#, press 2 for Eb, press 3 for F#, press 4 for, press 5 for Bb and press 6 C# 2. You can press the piano keys as well.
