Hanayama | Delta Hanayama Metal Brainteaser Puzzle Mensa Rated Level 3 - 75*119*45 mmThe Delta puzzle is formed by joining three separate pieces that mesh with each other. It is designed by 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 this puzzle is simple in form, its geometry somehow challenges and stirs up our creativity. Designed by Kyoo Wong from Hong Kong. The theme is the number three.