Your first and easiest chance will be during season 2, smith optics rampage, event 4 (DC Challenge - Smash Attack 01). Run straight through the robots in front of you and then make the hairpin left at the end of the stretch. Follow through the containers, and make another hairpin left making sure to hit all robots, and no buildings. Do a donut around the last obstacle, and then run over the last robot when coming out of the donut. If done correctly, you will hit all 32 robots and no buildings, and receive a platinum medal as well.
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