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We've played the game 100%. However when we go back to play Under The City, we get a green arrow showing up by the 2 water tanks by the riddler window. there is no way to go left, so we keep playing the game until finally we're in the jail cell with killer croc and the door closes as soon as we get in there. To the left is another room where this green arrow appears again as well as other white little arrows. We have no found any way to leave the jail cell and go into this other room! I can find two other questions posted here (now archived) about this exact phenomenon, but there were no definitive answer given in either case. Can someone solve our mystery? Thanks.