Help guide the red ball to the flag at the end of each level. Put powerups in the ball’s path to reach the flag and collect all three stars. Use your mouse to select and place the powerups in exactly the right spot, then hit START. Press EDIT or the R key if you need to make changes to the powerups again.
Source
https://www.coolmathgames.com/0-simple-motions
Simple Motions screenshots
