Watch the little cut scene here and come back. Turn to the right here and proceed on the catwalk until it ends. Once it does, Line Launcher yourself to the opposite side and continue along here. Once the path on this side ends, Line Launcher yourself to the circular opening. Sprint straight down this tunnel and you are officially in the bowels of Arkham. I hope your bags are packed.
This is fairly straight forward here. You see the distance marker on your HUD? This is how far you are from the closest spore. Do note that you cannot sprint on the platforms in here. You can, however, tilt your left stick as far as you can without hitting the Run button. Ok so, for this first part, go straight down this platform and climb over the metal fence when you come to it. Continue ahead and turn right when you can. Keep going in this direction and climb over the next metal gate when you come across it. You’ll have to turn right again when the path presents itself. Right around here, you will see Croc pop up and charge you. Throw your Baterang at it to knock it right off the platform (haha fatass!). He’s going to come again very soon so be ready.
Go straight down this way and Croc will appear once again. After this, keep an eye out for the path to the right. Use your Baterang on the bulb and hit the Action Button to collect the spore. All right, there’s no way that you are going to need a walkthrough for this section of the game. Normally I wouldn’t mind, but this part is just so darn boring. There are four-to-five samples to collect, so come back once you’ve gotten those. Oh by the way, when Croc destroys a good deal of the platform and there’s a huge gap between you and the closest platform, you’ll have to use your Line Launcher. Also, when the screen tells you to run, just make sure you are running straight ahead. Keep running until the Run action is off the screen. So come back to the walkthrough once you’ve collected the last sample ok?
All right, for this next part, begin by sprinting as prompted. Stop once the prompt is gone. Once again, just follow the distance marker and make sure it’s getting smaller to know that you’re going in the right direction. Once you reach the final 100 metres or so, it’s time to run like hell. The camera can be a little annoying here, so try not to overcommit to your run. As you approach the turn, ease up on the left stick a little bit so you don’t fall over. Once you get the “objective complete” prompt, don’t be fooled! Go into Detective Mode and take note of the three explosive gel splatters on the ground. Wait for Croc to run over that hole and blow that sum ***** up.
+—-T o t h e B a t c a v e—-+
Ok, so we are safe for now. Look to the right with your Line Launcher and latch to the northeast of Batman. Take out the Joker Teeth here and head through the door. Go through the immediate hallway to the left here and get into Detective Mode. There’s a fair sized wave of enemies here. There’s one guy with a rifle and another one of those guy with the knives. Take these guys out and go down the stairs. Go towards the Riddler Trophy in the circular ledge. Use your Line Launcher to reach it. Next, Line Launch back and look on the wall to the left for a vent (it’s on the right if you decided not to get the Riddler Trophy).
Drop down now and sprint straight ahead into the Bat Cave. Just keep sprinting and go towards your super computer to activate a brief cut scene. At the cut scene’s conclusion, you will receive arguably, the most powerful gadget in the game: Ultra Batclaw. It has three hooks instead of the usual one. Ok, so, now that the cut scene is over, jump over to the circular platform and get into Detective Mode. Look for the detonable wall. Aim at it with your new Batclaw and pull it down.
+—-J o k e r ‘ s F o r t r e s s—-+
Jump across to this new opening now and look up for a grapple opportunity. Sprint straight ahead and you will find yourself back outside. Pay attention to this cinematic here as it shows you where you need to go. So let’s begin, shall we? Take a leap of faith and glide towards the closest island below; the first one Batman looked at. Next, take out your Line Launcher and aim towards the island beside you. Go deeper into this island and look up for the grapple target. Once you get on this platform, look up again to find another target in your little island (i.e. don’t look outside). Look up again and find the final grapple target.
Back outside now, use the Line Launcher and make your way across to the island across. Glide down to the little stone bridge below now. Look to the right for a vent to grapple up to. You’re back in the sewer now. Head up the stairs to the left and sprint down this hallway. You’ll see a Riddler Trophy in the vent above here. The hallway to the left is where we want to go when you are ready. By the way, you can use a contextual action to take out those damn plants.
All right, you’re now back in the Main Sewer Junction. Head up this area as you normally would. First, turn to the right and climb up the platform. Jump across the next few catwalks and then jump over to the platform leading to the ramp. Once you make it to the top, there’s a huge plant blocking you from where you’d normally go. Instead, take out your Line Launcher and aim towards the middle of the room, to the very left. There’s a wall here you’ll be able to shoot your line onto. Sprint to the right on this middle platform now, and you’ll be able to climb up pretty soon.
Sprint across this middle platform now, until you are right above the wall you used to get over here in the first place. Take out your Line Launcher again and look to the corner in the left. There should be another target for your to latch onto. Once you make it over, climb up the next few platforms and go into Detective Mode. Look up and identify the detonable wall. Use your Ultra Batclaw and bring it down. Use your Batclaw to dispose of these henchmen easily, using L1+R2 to bring them down. Once you’ve got them, grapple your way up. There are a couple of henchmen for you to take care of here. Once you’ve taken care of them, look for the Riddler Map to the right of the detonable wall you used to get up here, by a control panel and the Joker TV set.
Proceed into the hallway now, and be sure to pick up the Interview Tape on the right. Head through the door when you’re ready. There are two henchmen in here, immediately. Rough them up, and turn into the opening to the right. Proceed down this hallway and into the Control Room. use the Silent Takedown on the first guy and work your way through this room. Don’t engage in any battles with them, as you will lose. Always use the Silent Takedown. If you get spotted, run like hell. Once you’ve got them all, head up the stairs in the right parts to the actual control room. Goto the Security Control Panel and jam it. Time to leave the Control Room through the door you came in from and run across the hall to the next opening.
Don’t worry this room is a lot easier. There are some guys with the knives, but otherwise, you will be dealing with run-of-the-mill enemies here. Take care of these guys and jam the two Security Control Panels in this room to complete your tasks. Head back outside to the main hallway now. Stay put for a bit and wait for the Titan to arrive. He will come with a bunch of cronies. The key again is to focus on the Titan. Counter the henchmen’s attacks so you don’t get hurt, but your primary focus should always be to land a Baterang attack on the Titan, and hopefully to take control of him. This might take a few tries, but as long as you focus on the Titan and don’t get distracted by the henchmen, you will be fine.
Leave through the opening and grapple/Batclaw your way up. Once you reach the small detonable platform, you’ll have to use some Explosive Gel on it before you can Bat Claw further. Once you reach the surface, it’s time to head to Botanical Gardens. Once in Botanical Gardens, there are no directional challenges. Make your way to the room where you found Ivy the first time you were here.