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The grappling gun.
His camera :)
Her iPod
Bats cant count
When you get the Freeze Blast gadget, you can block steam pipes so you can get past them.
You don't 'get' them for him, you destroy them using the explosive gel gadget.
the batsicle
swimming
the override gadget is in your inventory and you run up to penguin and activate it...pressing the gadget button. then he mentions how it stopped working...then just punch him once.
Batman!
BATMAN