This page of our FNAF Security Breach is dedicated to Roxy boss battle.
To be able to face Roxy, you're going to need to fix the robot's head and activate the go-kart. Details of these activities can be found in the walkthroughs for Roxy's Weakness and Repair Robot Head missions.
After being decommissioned, Roxy will become completely blind and will hunt by sound. She will also receive a new ability - lunge attack.
Start by saving the game and press the button at the door next. This begins the fight - Roxy is provoked to break the door down. Go to the next room and turn left immediately. There is a hole that Roxy will not be able to pass through - use it.
Then, run down the corridor and jump into the hideout. In the same moment, Roxy will perform a jump, after which she will be behind you. Jump out fast and get past the door located at the end on the corridor on your left
Turn left immediately and go through the hole in the wall again. At this stage, you need to use Roxy to open the door for you, as it cannot be opened normally. Simply place yourself near the door and provoke an attack. As soon as the animatronic starts rushing towards you, hide in the nearby hideout. This way the door becomes open.
Final sequence involves crossing a burning room. It isn't that hard - hide in the hideout, wait for Roxy to pass you, so you're closer to the exit than her, run to the next hideout, and so on - keep repeating this until you reach the ventilation shaft that ends the encounter