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The Acid Rain is a combo weapon in Dead Rising 4.

To make it, combine a flare gun with any item in the "chemicals" category. It's capable of firing acid loaded rounds into groups of zombies, causing devastating acid damage.

The blueprint for this weapon is found at the Kippax Cement factory. This location is not accessible until Chapter 5, so the story must progress before being able to find this blueprint.

The Make it Rain combat trial requires 100 zombies to be killed with this weapon.


  • Press and hold Left trigger while the Acid Rain is equipped to aim the weapon. Use Right trigger to fire the weapon.
  • To fire without aiming, Right trigger can be pressed to fire the weapon quickly.