With the points can be increased and material increase in the establishment of a new robot, and the corresponding unit upgrade. Up and down about to control the direction of space for the soldiers made. Twenty years later, technology has developed to a certain level, the robot is not rare, and two decades after the war, these robots are to play, because they are only aware of the implementation, I do not know back, is really very terror, Come and command your robot to avoid being hit it! direction keys operation.