Go To Ben’s Cell
After the cutscene, exit the room and take out the Zombies in the Hallway, once you’ve entered the Front Hall, make your way upstairs and shoot the Zombie with a Backpack to retrieve the Old Key and pick up some High-Powered Rounds (SLS 60) from the Item Dispenser. Unlock the front door and shoot the Zombie with a backpack to collect the Chemical Flamethrower and an Old Key, use the Key to unlock the door, allowing you to break free from the Orphanage.
Grab yourself a Flash Grenade from the Item Dispenser to the left and head towards the Bus, as you approach a hoard of Zombies will start making their way towards you, simply wait until they’ve all exited and circle around them to enter. Take out the two Mutated Zombies waiting for you, then head over to the basketball court.
Enter the court and slowly head towards the red bench to shoot the Raccoon, quickly take out the Zombie with the backpack to retrieve the Old Key and unlock the gate to the south of the court, follow the path until you reach an Item Dispenser and grab some more High-Powered Rounds (SLS 60). Follow the path around whilst taking out the Zombie Dogs and Mutated Zombies, once you’ve gone through the next gate, head over to the Ambulance to find another Raccoon.
Head into the Parking Garage and take out the Zombie with a backpack to retrieve the final Old Key, head into the Jails and make your way around to Ben’s Cell, stun the Zombies with the Flash Grenade on your way through.