A set of nine outstanding giant card game sets. Great fun & perfect to take anywhere & divide up amongst lots of people. They can also be used again & again. The Optical Illusion set contains 50 fo the most amazing optical illusions created. You can turn over each card to discover some of the secrets behind the illusions. All of the other sets all come with a dry-wipe marker pen, meaning that you & write & work out your solutions onn the actual cards, & simply wipe them clean afterwards. Each box is packed with fantastic puzzles & challenges.