This game involves paying close attention and on memory. Use your memory skills to remember where the ball is, and use your attention paying skills on keeping an eye on the shell that is covering the ball. But, there is money involved. It is play money, of course, but it is money nonetheless. So, before you play the game you get to bet an amount of money. You don't start off with much so bet low. Go ahead and see how much money you can make off of this game of memory. Keep your eyes on the ball, because in this game, you have to.