Tangrams are really fun especially if you like brain teasers. There is a long and ancient history involved with Tangrams. Essentially they are based on geometric principles. You have 6 blocks or so and you have to configure them into a specified shape (shapes are illustrated in a booklet). The puzzles are even more exciting if you do it with friends (each with their own Tangram set) and see who can configure the shape the fastest. Great gift idea.