Click on PLAY to start. You have 99 seconds to guess as many notes as you can! If you just want to practice without the time constrain, mark the "free practice" box.
You can pause the game at any time by clicking on PAUSE. You can also reset a game and start a new one by long-clicking on the PLAY/PAUSE button.
Click on OPTIONS to open the options side bar. There you can select the instrument, note type, difficulty level and what sound FXs to play or mute.
You can mute/unmute all sounds at any time by clicking the SOUND ON/OFF button.
Click on the LEADERBOARD button to see the highscores tables. If you set a new record, you will be there. Good Luck!