To be played like guess who. Print and laminate shape cards to be stuck to a Guess Who Board. (I purchased the Kmart version - they can also be purchased from other cheap shops such as The Reject Shop). Students play by asking yes/no questions similar to the way they would playing the traditional Guess Who Game, however, these questions will relate to the properties of the shapes rather than people.
I coloured in the black and white shapes to be a similar colour to shapes with similar properties.