31 Lock - Burr Puzzle Lock

Step up your puzzling with the 31 Lock, a carefully designed 3D‑printed burr‑style puzzle from Canadian creator Dan Fast. Sitting between the 20 Lock and the 42 Lock in difficulty, this version requires 31 sequential moves to unlock the mechanism.

Your goal is to remove the interlocking burr sticks in the correct order, gradually loosening the structure until the shackle comes free. The interactions are clever, the sequence is engaging, and—as with all puzzles in the series—putting it back together is often the hardest part.