A four-wheel robot concept with a simple mechanism and high mobility for all-terrain usage. The robot has four drivable wheels and two leg-like axles. Each wheel is mounted on one side of the leg-like axles at the front and rear of the body. RT-Mover has four active wheels and only other five active shafts, therefor the robot can move on discontinuous rough terrain whilst keeping a sheet part of the robot horizontally. It can move like a wheeled robot and also walk over a step like a legged robo