enemies that run back and forth. If an enemy approaches than they will leap at them. When hit by the Shovel Blade Ratsploders will be knocked back before exploding. Some ways of dealing damage like the Drop Spark or Flare Wand will cause Ratsploders to instantly detonate.
All of Plague Knight's arsenal will cause Ratsploders to detonate immediately.
In Plague Knight's room a baby Ratsploder can be seen running on a treadmill.