Move that cue around and see which ball can enter a hole.
Find a ball that is a direct hit of that ball.
Click the ball you want to hit.
Use the cue to see how straight that ball to the one you want to get in the hole.
Then place the crosshair on the ball to be hit by your ball on the spot that the cue you used as sort of a ruler.
I really advice that you get the scarf because that best ending is a surprise ending.