Works better in turbo mode (shift click flag). Some times it gets stuck. In this case, just drag it back on the track. The angle variable controls the angle at which the left and right sensor sprites move. I recommend an angle of about 20, but you can experiment with different angles. If you press a key, it will go to the next track. You can also make other tracks yourself! Just paint a new background with it. Use the color of the existing track. Make sure to make it sufficiently wide.
Thank you to Anki Drive, which gave me the idea. I got the turbo mode detector from @PROJSH12345 https://scratch.mit.edu/projects/23819246/#player
