Resourceful Rat - 6 Rat Keys

Ever since reading one of the developers confirm that you can get 6 keys total from Phase 3 of Resourceful Rat, I've been trying to figure out how to get the sixth key. It turns out that to get the sixth key you have to finish each phase with a maxed special bar, which I never really attempted due to the first part of the Punch Out fight. On this particular run, however, I got really lucky with building up special on the first part and was finally able to pull it off!