Marvin is fine tuned again for his third season! He now features a claw with one stationary paddle and one articulated paddle, each lined with rubber grips, to securely grasp the stones. The claw is mounted on an articulated wrist for stone-placement accuracy. The claw and wrist are both mounted on a long arm which rotates up and over to the front of Marvin to allow for a compact silhouette when not in use. He still rocks the holonomic drivetrain to allow for him to go in any direction at any time, without having to turn. He also uses the camera on the phone to find the Skystone during the autonomous period. His wires are nice, compact, and hidden; just the way he likes it!