You asked about scores and hiscores. Seriously, if you haven't grasped the concept of global variables, you'll have a hard time with anything you try to do. LittleStain has helped there.
Anyways... you could store your wheel colours as seperate frames in one WheelSprite animation (speed set to 0 - from the image editor)
Same with the balls, but in a seperate BallsSprite object.
If ball collides with wheel, check if the animation frames are the same. If so, then success.. if not.. then... fail..
If you still have problems, type @procrastinator and I'll get an alert to remember this post.. and will do something when I get time tomorrow