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