Using a laser, the robot can make highly accurate welds and position itself for each one a lot faster than it could if it were spot-welding in the normal way.
It is only when words on the walls start appearing, admonishing the player or offering backhanded encouragement after yet another violent explosion into giblets at the hands of a laser-equipped turret or murderous robot, that you realise the bastard is the game.
Behind a tinted glass panel 18-carat gold powder, laid down by a robot arm, sparkles as a laser fuses the metal into complex three-dimensional shapes, layer by layer.