Mix a potion in Professor Snape's class with this mastermind game. Try to find the right order to add the ingredients. Select an ingredient and place it on one of the scales above the cauldron. A white pin indicates the correct ingredient in the right place and a black pin a correct ingredient in the worng place. The position of the pins themselves says nothing about what ingredients are the right ones though. the trick is to find out which ingredients the pins correspond to.