This Batman: Arkham Origins walkthrough is divided into 17 total pages.
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BlackGate Prison #2
Once back at the Black Gate Prison, take out the prisoners outside.
Go down into the sewers to get inside the Prison.
Navigating through the sewers, you will need to use the Grapple Gun, Glue Granade and Batclaw to navigate and get on top.
Get inside the prison using the vent.
Inside you will face another Predator Room, with mostly armed guards.
Get inside the security room, and untie Harleen Quinzel.
Go down to the Cellblocks, you will talk with Deathstroke there.
After the conversation with Deathstroke, defeat the guards in the next block.
Then you will face Bane's men along with some prisoners, defeat them and move forward.
More Batman: Arkham Origins Walkthroughs
This Batman: Arkham Origins walkthrough is divided into 17 total pages.