Robots for the win. GBC 57 Robotic Control Center is now available. This alternate build for the LEGO 42129 4×4 Mercedes-Benz Zetros Trial Truck set combines 4 modules into one big machine. With the big star being the robotic arm. This programmed contraption can move GBC Balls and drop them in different location. With the optional upgrade of a LEGO Color Sensor you can even sort GBC Balls this way by color. The GBC also features a Double Ball Pump Module (Free building instructions available) and Pinball Lane and a Wide Stepper Module. Interactive knobs on the side lets you take control in the ball madness. So what are you waiting for?