Dieter Gebhardt
Dieter Gebhardt has published over 70 articles on puzzles and is considered a leading expert in the field of rotational puzzles.
Geert Hellings began collecting rotational puzzles in the early nineties and is currently the President of NKC, the Nederlandse Kubus Club (Dutch Cube Club), an association with 500 members from all over the world.
Wei-Hwa Huang is a four-time World Puzzle Champion and one of the first few people in the world to have solved an actual 6x6x6 and 7x7x7 Cube.
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