What number comes after 3 when the night falls?

You need the Freeze Gun to out riddle the Joker in Batman: Arkham City. When you have it you stand at the back of the room where the trophies are. When the first two jet across from each other start releasing gas you freeze them. It moves to the second set in the middle. Freeze them. Move to the front of the room and when the third set open freeze them. Joker will say that you failed and then the door will open and he will accuse you of cheating.
Updated on Monday, February 06 2012 at 04:01PM EST
Collections: arkham citytrophyjokercheatingbatman