load up port scalywag on easy mode from garden ops as that's where pirate zombies spawn every wave and plant your garden on top of the boat as a pea shooter. from there fire your peas and chilie bombs at them each wave without planting any pots (because plant pot kills won't count sadly) and at the end of wave 10, instead of going to the extraction point, find the red tomb stone and there's where you can farm your remaining pirate zombie kills til the time goes up. in the end you'll get 130-140 bandit zombie kills per game. hope you all find this helpful.