This game uses the principle of the shell game is a game of observation where you must discover which cup is hidden under the white ball after which the cups were mixed. But here it is for fun and to test his vision.
Choose your level of 1 - slow mixing speed - 5 - mixing speed fast - and then click to start the game. Be very careful to move the cups to find where is hidden the white ball. Click the cup when you assume that is the white ball and see if your eyes do not play tricks!