On the top right, you’ll see the “Leave Session” button that allows you to leave the session early (but your score won’t count towards your statistics).
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In the bottom right corner, you’ll see a speaker button, which will allow you to toggle the sound on and off.

To the left of that, you’ll see the settings gear.

If you click that, you can change the size of the ball, the color, and the speed.

The size and the color are completely up to you.

The speed is best slower if you want to calm down, faster if you want to increase your activation levels, and middle of the road is best in most cases for most people.
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To the left of the settings, still in the bottom right hand corner, is the “Recenter Ball” button, which allows you to recenter the ball on your screen if it changes position.