You have been locked in a prison where illegal genetic experiments have been going on. The scientist figure out how to genetically make anyone go into a rage. They call it the Abuse virus. It has gotten loose and spread through out the entire prison. You have to fight your way through all the mutated and enraged enemies and make sure this doesn't leave the prison.
Here is one of the walls being shot at and exploding to reveal a new area.
Shoot hidden walls to destroy them
Ain't nobody got time for that!