A pen hangs from a pendulum and the paper keeps moving. You do not draw the line - you choose when to stop it. Tap CUT at the moment the curve matches the target, and the sheet is judged where it stands.
Set the swing wider or narrower to change the shape. Cut too early and the line is a stub; wait too long and it runs off the page.
A rhythm game for a steady hand and a good eye.
Let the swinging pen draw, then cut the paper at the right beat.