The Delta puzzle is formed by joining three separate pieces that mesh with each other.It is the brain-child of Hong Kong native Kyoo Wong who, with the eye of an engineer, has worked on a number of cast puzzles. While simple in form, its geometry somehow challenges and stirs up our creativity. The theme is the number three. Provides puzzles for older children and adults which are solved using a blend of inspiration and logic. The challenge is to take the puzzle apart and put it back together. Simple, yet so deep, you will need your hands and your brain on board to solve the huzzle puzzles! Develops imagination and creativity A great gift idea Ages 8+