Objective 1: Raise the Ship
Take down the goons in astounding fashion by using ground finishers. This earns you the combat challenge reward. Once the baddies are taken care of, bust up the thorns along the back wall.
Combat Challenge: Finishers
Build the LEGO bricks into hyper strength handles. Have Solomon Grundy pull on them to rip the wall away. Inside of the cave, you find a statue, smash it up to find some bricks.
Use the bricks to build a lantern pad. Have Green Lantern interact with the pad to raise a boat from the sea of jam to the right. Cross over the boat and beat down the goons that ambush you.
Objective 2: Bring Down the Force Field
Smash the rocks near the mechanism beside the force field. Some bricks spill out of them that form a grapple handle. After building the handle, pull on it to destroy the mechanism and bring down the force field.
Objective 3: Shut Down the Pipes
With the force field down, head up the stairs until you come to a set of super-strength handles. Have Wonder Woman rip at them to clear the path.
Continue past the boulders and beat down the goons. When you come to a force field, have Wonder Woman use her mind control on the goon on the other side to have him throw the switch.
Take hold of the grapple handle and rip at it to clear the path. Continue onward.
At the bend in the path, you are confronted by more goons. Once they’ve been dealt with, look for a pile of bones in the left corner. Clear them to find a dig spot. Dig into it to find some bricks to build a pipe nearby. Build the pipe to reveal The Joker Card.
The Joker Card
Continue along the path until you come to an area with a pool of jam. Locate the pile of bones and clear them away to access the dig spot. Dig into the spot to reveal some bricks. Build the bricks into a valve cover to shut down the nearby pipe that is spraying along the back wall.
There are some twirl poles on the left side. Have Robin swing on them to drop down a valve handle.
Carry the handle to the upper right corner and place it onto the valve. Turn the valve to shut down the flow of the pipes. Head north to end the level.