When you get in the Black Market, Alfred will say something about booby traps. The first two are unavoidable. If you want to complete the level you must activate them. The first is after you get off the elevator. You will go through a door and into an office. In the middle going across are the motion lasers. There is no way past them. Next, you must trip the motion sensor. Once that is done, gas will be emitted into the room, Quickly run to the door that you came through. Look to the left, jump on the couch, and look up on the left side of the room. There is a balcony with a grate, on which a grapple may be used. Do this, then drop from the grate. Run to the conjoined room. Look for a large vase. Throw a Batarang at it to relieve your lungs of the gas. Jump in the room with the vase that you broke, then find the door and continue to the next booby trap.
The second booby trap is a lot simpler. You will first notice a vase. It does not need to be broken. Past it you will see two paths (left and straight). Go to the left. At the end of the hall is a door guarded by motion sensor. Trip them, then run to the left or right wall along the hallway. A painting should slide up, revealing a mini gun prepared to spray the door on the opposite side of the motion-sensored door. Above the painting is a grate. Grapple and wait for the intermission sequence. A man will come out of the locked door. Finish him with the static type of attack. Drop and go into the room that the man came out of and kill the unarmed man. Look for the button to open the door which was shot at, and the door will be unguarded and unlocked.
