This memory game uses a plastic case covered with doors. A picture wheel is inserted into the case and is spun with a lever. On your turn, you open two of the doors and show the pictures revealed to all the players. If the two pictures match, you open two more doors and so on. If the pictures don't match, you close all the doors and pass the case to the next player. The first player that opens all the doors on a single turn wins. - BoardGameGeek