László Molnár is well-known for designing puzzles that are based on a seemingly simple idea, but are actually fiendishly difficult. In recent years, Molnár's designs have featured prominently at the International Puzzle Party, and his packing puzzle Hat Trick received a Top 10 award at the 2019 IPP in Kanazawa, Japan. A Google search for "laszlo molnar puzzles" will turn up lots of information about his designs, including links to several that are commercially available.
Click on the image below for a collection of Molnár's designs.
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All puzzle designs are (c) their respective designers and are licensed for personal, non-commercial use only.