This is for using the Green Zombie Girl in the middle of the three characters; RottyTops. By holding the
button and aiming with the
RottyTops can throw her head. If the head hits an enemy it will deal 5 damage. This is best farmed on low HP enemies such as Purple Bats or Crabs. Using the
will attack with her Leg and not by throwing her head, so make sure you use the
button. I personally recommend the very first level. There are 3 crabs within quick succession at the start of the level and are easily killed with the head toss.