Lego Mindstorms NXT is a robotic kit. It is made to build and program first robot in 30 minutes. The kit replaces a system called Robotics Invention System. The available versions are: "Lego Mindstorms NXT 1.0" (set #8527), "Lego Mindstorm NXT 2.0" (set #8547) and "Lego Mindstorms Education NXT" (set #9797). It comes with the NXT-G programming software. It is possible to use unofficial programming languages, such as NXC, NBC, leJOS NXJ, and RobotC using software that is not included with the kit.