Discover a special limited-edition collection of collectible mechanical puzzles created by some of the world’s most respected puzzle designers and master makers. The Puzzle Designer Series: Volume I was carefully curated to showcase four remarkable puzzles that each represent a completely different approach to mechanical puzzle design. Together, these creations highlight the artistry, engineering, and creativity that made their designers legendary within the mechanical puzzle community. From elegant metal mechanisms and mathematical precision to handcrafted Japanese puzzle boxes, every puzzle in this collection delivers a unique tactile and intellectual experience designed to challenge, surprise, and reward curious minds. First Cross Designed by Wil Strijbos - The Netherlands Difficulty Level: 3.5/5 - Advanced The First Cross is one of Wil Strijbos’ most iconic mechanical puzzle designs, celebrated for its deceptively simple appearance and deeply satisfying mechanical solution. At first glance, the puzzle appears minimal and straightforward, but hidden beneath its industrial form lies a carefully engineered interaction that rewards experimentation, patience, and logical thinking. L