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use explosive gel
No, they do not disappear. The collectables are not missable, you can get them all after completing the game.
Joker arkham city would beat him up 2 reasons: The Injustice Joker would be tied up and Joker would kick him out of his lair. He would have Injustice Batman with him
The Joker could beat him up. The Joker would try to kill Luthor with his gun. It'll just stun him so Joker could knock him out. Joker knocked him out with one punch in the face. Joker wins.
easy you don't laugh