User blog comment:Milesprower2/Dr. Zomboss Health/@comment-5407503-20121128110131/@comment-5792287-20121130095530

KernelFodder, Football Zombies take precisely 80 peas, so if instants do 80 peas of damage, they would kill a Football Zombie.

One way of working this out is in Big Trouble Little Zombie where every Zombie has 25% of their normal health, and Football Zombies only take 20 Peas in that game.