Not much to say about that one other than it's pretty simple and nice for maybe 5 to 10 minutes.
Make a bet, watch the shellz change places, and pick the right one when it's done spinning.
As you can see from the screenshot, it is kinda simple (I was betting all each round).
26,214,406 points was when I stopped, clicking the 50K button was becoming quite a chore at that point ;-)