Intensive Treatment--Part 3

Locate and Analyze the Holding Cells for Evidence

After the cutscene, head back to the Holding Cells by backtracking down the same hall you took to get here, making a left at the first junction, then a right at the second (use the map if you get lost). Take down the pair of thugs you encounter then continue through the nearby door into the Holding Cells area. Make a left into the room on the left and activate detective mode to scan the dropped whiskey bottle.

Track Gordon's Movements by Following Boles' Whiskey Trail

After scanning the bottle, use detective mode to follow the trail of whiskey, as marked by the on-screen markers. They'll lead you to the Secure Transit area, directly south of your present location. Once there, grapple up the elevator shaft then leap to the far wall, which you can shimmy across into a ventilation shaft. Follow it out the other side and grapple up a couple of ledges above and jump another gap.

Climb up a couple more ledges, hop over a short wall, then crouch below a couple more to a wall you can shimmy along. Hop over the gate-thing and continue along until you reach a tall wall you can grapple up. Crouch into a ventilation shaft at the top and follow it to a drop-off, with a ledge you can grapple to on the other side. After grappling, take down the group of inmates, then enter the far ventilation shaft, which leads to Cell Block Transfer.

Inside the Cell Block Transfer room, use detective mode to spot several armed guards just around the corner. You don't want to tip them off to your presence, so you'll want to use stealth to get behind them instead. Grapple to a gargoyle directly overhead, then across a few more to cross the room. Drop from the last one, then crouch to sneak up behind the guards and perform a silent takedown.

With the guards taken care of, turn around and climb a staircase just right of the locked door--sneak up behind the guard talking to the Joker and take him down before entering the nearby vent.

After exiting the other side, sneak up to the guard for a Silent Takedown. Now there are still two guards left, one of whom is roaming the catwalks above. Grapple to one of the gargoyles and use Detective Mode to find him--now either wait for him to expose himself and simply Glide Kick his face in, or drop down and sneak up behind him. Be careful, as the second guard may soon follow to check up on him--if not, you'll find him on the lower floor. Either way, grab the interview tape on a table in the central room and take finish off the baddies to trigger a cutscene.

After the cutscene, three more guards will enter the room. Grapple to a gargoyle and wait for them to disperse so you can Glide Kick them from above, one at a time, without alerting the others. When done, grapple to the area they entered from (on the south side of the room) to find a corpse being used for one of the Riddler's riddles. To solve it, simply turn around and scan the painting along the left wall, just before the drop-off. Having solved the puzzle, meet-up with the friendly guard just ahead to learn of what's happened.

Escape from Intensive Treatment to the Island Surface

After speaking to the guard, continue down the stairs and follow the path, which eventually leads into a small room with a vent. Duck inside and follow it to escape outside. Once there, grapple up the cliff-wall to complete the objective. Now that you're overlooking much of the island, glide to the ground below and enter the Arkham Mansion ahead and speak to the guard inside, then exit back out.