Here's the simple way to get this. Select exhibition and break out the second controller. Controller 1 should be set on Rookie and make sure to pick the Madden Development Team (Over 99). Controller 2 set on All-Madden and pick a weak team like AZ. When you do your punt with controller 2, let the computer control the run back. Using Controller 2 you want to mash
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back and forth VERY quickly. That should keep the defense leaping to the ground and allow the computer complete the runback for a TD.