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All Level 1 Guides
All LEGO Marvel Super Heroes 2 Guides

To destroy the reinforced metal to save the civilians in the cage in level 1 of LEGO Marvel Super Heroes 2 use Rocket Raccoon to throw a grenade at the reinforced metal cage.:

To destroy the reinforced metal use Rocket Raccoon to throw a grenade at the cage.

Switch to Groot and go over to the area with the wood and build a bridge for the civilians and your companions.