This robot is a tank. I built it and (if its not to late) will enter it in the Tank Challange. Anyway, about the Tank itself. It is driven by the front sprockets of the back treads. The other 2 sprockets ate just there for stability. The 4 wheels in the middle front are for stability, as are te front treads. The wheels are on the same axis as the back wheel of the front treads, so if one moves, they all move. 2 touch sensors in the front provide a bumper for contact awareness. There are pegs in the back treads for traction. The cannon on the back right can shoot up to 6 feet, which can be determined by the Ultrasonic Sensor. The color sensor can be used for whatever you want. Finally, my new acclelerometer/Tilt sensor is located behind the color sensor. Now you're probably saying, "Hello, Robogeek525! There can only be four sensors! You have five, dumbo, learn to count!" That's true, but for different missions you can swap sensors around. For Hilly terrain, connect the tilt sensor. For sniper missions, connect the ultrasonic sensor, for night missions connect the Color sensor, for Crash Misions connect the touch sensors. Please, rate, comment, like, and follow!