Hey:) I have already checked your ME3 walkthrough. Batman AC is not a hard game but there are stuff I have forgotten since I last played Batman AA.
Batman Arkham City Walkthrough
Holy toledo, Batman! Our Batman Arkham City Walkthrough will provide info about gadgets, a storyline guide, and locations of secrets.
Ninjas and Robots
Mr. Freeze needs a special ingredient to finalize the serum, and it seems our lovely ninja friend has the answer. Switch to detective mode and you'll be able to track the ninja's blood trail. This will eventually lead you to the roofs of Arkham city where you will need to perform a counterattack and place a tracker on the ninja. If you want to see the actual location, check out the video clip above.

This tracker will lead you to a hole guarded by the Joker's men. Wait for them to disburse before dive bombing through the gap and down into the Gotham sewers. As you follow the tracker signal you'll need to make use of your line launcher to get over some of the various fractures.

Joker's thugs are huddled in key locations. For the first of these positions you can drop down the wooden flooring or use explosive gel to take on several enemies. This will eventually lead to to a TYGER elevator where more of Joker's gang is stationed. One of them has a jammer backpack that will halt the use of detective mode. Not being able to see your target's locations is a giant hindrance, so the backpacker should be your first target. Clear out the rest of Joker's team and you can continue your pursuit of the ninja.

You'll soon enter Wonder City and will need to scan all of the broken robots within the area. Once again detective mode will make this rather easy. Be ready for combat though, as each time you download enough information from the robots, ninjas will ambush you. Dodging and blade countering is the best way to deal with these surprise attacks and overall aren't much of a challenge. Once you decode all the robots, head to the secret entrance and meet with the assassin leaders.




