Cut out paper witch hats. Whatever number you think would suit the number of people at the party. Color two hats a different color from the rest. Hide all the witch hats throughout the house (area where you would be doing this game). Send the kids to find all the hats. The kids who find the different colored hats get the biggest prize and the two who got the most hats collected get the next biggest prize. Have extra prizes in case of ties. Also, you might want some small prizes for the people who didn't get a prize.