This is the walkthrough part 9 where Superman helps Batman and Robin to deal with Lex and The Joker.
Citizen in Peril
Use Aquaman to save a citizen trapped by a few puddles of toxic sludge on the left side of the third level of the lobby.
Use Superman’s heat vision to bust the gold top which is in a glass case on the left side of the room.
Use Lex’s Deconstructor on the top of the case in the back right corner of the room to build with the bricks inside.
Destroy the silver object on the right side of the third level of the lobby.
Open the right door by pulling the switch.
Bust up the objects inside and build with the resulting green LEGO bricks with Green Lantern.
Checkpoint 2nd Floor
Use Cyborg’s magnet power on the blue console after activating the conveyer on the wall to operate the wheel emerging to realign the conveyer tracks. Then stick a missile to the track and you will get the Minikit.
Destroy 5 Luthor monitors
To the left of the elevator on the far right of the 2nd floor.
To the left of the elevator on the left side of the 3rd floor.
4th floor right behind the vent you float up.
4th floor just past the three kryptonite towers.
4th floor on the far right side of the room.
Bust the glass on the right side of the 3rd floor to pull the lever to reveal a Joker Box where a Minikit is.
Find the orange Power Handle that is behind the second kryptonite tower on the 4th floor.
Clean away the sludge on the floor panel on the far right side of the 4th floor with Aquaman then switch to Cyborg to use his magnet powers for removing the panel.
Checkpoint Giant Robot Fight
Go up on the wall in the back of the room where the giant robot fight takes place.
Clean the sludge which is in the lower right corner of the robot fight room with Aquaman then switch to Joker to activate the console you build out of the resulting bricks.
Step on quickly all four switches appearing in the middle of the room then use Flash to rebuild the deconstructed LEGO bricks.
Dance Party will begin later on