Switch track, but don’t lose balls. Tap to rotate the center piece, and switch to a new track. Miss one, and everything blows up! Or at least one ball blows up.
You will need to foresee the balls movements to keep them in line, and make sure the center track piece is always aligned with the correct rail. Each ball rock back and forth on its own line, keeping infinite momentum.
The difficulty ramps up as you keep going. It’s easy enough to manage two different tracks at once, but can you move your turntable fast enough to prevent three balls from colliding? What about four?
