Guide the ball to the flag in each level by creating a path with your mouse. Be smart though, the path won't stick around for long!
You need to draw the path to the flag for the guy to cross.
You need to draw your own path to the flag and then use the arrow keys to get there.
You need to draw yourself a path to the flag and then get there.
Check out this amazing artist create an impossible staircase using 3D chalk art.
Don't pass out around your buddy if he's an artist.