Challenge your mind with the Hanayama Cast U & U, a captivating brain teaser designed by Kyoo. Featuring two interlocking U-shaped bolts and four nuts, this puzzle offers a clever and deceptive challenge. Made from premium cast metal, it’s built to last and test your problem-solving skills. Ranked 4 out of 6 in difficulty, it promises hours of engaging fun. No solution included, so prepare to think carefully and creatively.