Practical Engineering's handheld arcade-style puzzle box (2015-05-29) combines walnut/maple woodworking and Arduino-driven electronics: 3 potentiometers, 10 LEDs, two panel meters (with trim pots), a button and a vibration motor. Each round randomizes a target LED per meter and the mapping from knobs to needle movement; aligning both needles to their LEDs triggers vibration and a reset. Source code available on GitHub.