compared to wheeled robots, biped robots have their advantages. biped robots have better mobility. biped robots can walk in human environments, such as rough terrain and the place that contains obstacles, and can also climb stairs or ladders. a biped robot has "discrete" footholds; therefore, it does not require a continuous path of support as wheeled robots. moreover, biped robots can turn around in a small area. however, it is more difficult to balance and control the biped robot, especially on the rough or slope surface, compared to wheeled robots.