For our second challenge we led our robot through a small maze. We had many mini lessons that led up to this challenge. Some requirements of this challenge were to use a touch sensor, to stop at an object, use an ultrasonic sensor, to stop at an x, and use a color sensor to stop at a red line ending the maze. We started the maze by going forward and then turning right. After turning right we programmed our robot to go straight until it touch the trash can, then the robot would move backwards, using the touch sensor. The the robot would turn right again and go forward. The robot would go forward until reaching the x on the floor. We achieved this by using an ultrasonic sensor. The the robot turned left and went straight until it reached a red line. It stopped because we used a color sensor. During this challenged I learned how to use an ultrasonic sensor, and I learned how to program a robot to stop at red line, rather than typing in the number the color sensor says.