Hello! This is my entry to the Out of the Box building challenge. This robot, as it's name implies, plays tag. Once activated, Tagbot rushes forward, until something is detected by it's Ultrasonic Sensor. It swings it's arm forward, to tag the other player. It then turns around, and rushes away, until the other player presses the Touch Sensor. Once that happens, Tagbot turns around and the program repeats. Sorry about the awkward wheels, I'm using my other wheels on a replica of Megaleg from Super Mario Galaxy in a homeschool Lego contest right now. Once I purchase EV3, I'll see if I can make the EV3 Tagbot play tag with the NXT Tagbot. I would have uploaded a video, had it actually loaded.