Play against the computer. Use up and down arrows to move the blue slider on the right. Computer is on the left (red) Can be used with up/down arrow keys, or any mouse, joystick or camera mouse, with a minor adjustment. See note.
This was an example of Artificial Intelligence (programming the computer to follow the ball) by Eric, but I wanted to finish it so that it could be played and add it to my IWB games studio. It is adaptable for alternative mice, joystick. Could be modified to make it more challenging by resizing the sliders, but I made it to be used to learn to use the AT.