The Arkham Knight’s Gas Room: How To Escapeīatman Knight is a formidable foe, and it will require all of your skills to escape the gas room and make it to safety. The gas is permanently removed by launching Line Launch across the gas-filled room, directly beneath the bookshelf on the other side, and using a Batarang to hit the panel. In the distance, there is an Ultra Batclaw that you can use to tear down another breakable panel. How Do I Clear The Joker Gas From The Guard Room? To obtain the Joker gas, place a batarang near the bookshelf in the guard room and line launch across the room. If you want to earn the achievement/trophy Mystery Stalker, you must catch the watcher before he leaves. The watcher is waiting at the top of the ferris wheel, and you must have completed the steel mill for the first time in order to meet him. In Arkham City, there is a watcher located in the eastern part of the Industrial District. However, the true identity of the watcher remains a mystery. Some believe that the watcher is actually the Joker, while others believe that it could be Batman himself. This has led to much speculation among fans as to who this character could be.

In the Batman Arkham City game, the identity of the mysterious watcher is never revealed.

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