Another challenge ... Take a square that is 4' x 4'. Put a small 6" x 6" square in the middle. Place the robot on the center square. Place the red and blue ball randomly about the large square. Find the red ball, bring it back to the center. Find the blue ball, bring it back to the center. For a variation, if you have the balls, put in more than 1 red and more than 1 blue in the large square. Collect the red balls first, then the blue. Bear seems ready to take on the challenge!