Shell Game

Shell game is the classic game where three or more identical containers (which may be cups, shells, bottle caps, or anything else) are placed face-down on a surface. A small ball is placed beneath one of these containers so that it cannot be seen, and they are then shuffled randomly. You are invited to bet on which container holds the ball As the game progresses, so does the difficulty. You will start with 3 cups, and progress all the way to 7 cups. 1 – 3 levels – 3 cups. 4 – 6 levels – 4 cups. 7 – 9 levels – 5 cups. 10 – 12 levels – 6 cups. 13 – all next levels – 7 cups. How closely can you keep your eyes on the cup holding the blue ball?