Objective 1: Start Up the Fun House
Near the start of the level, look for some LEGO bricks on a platform to the north. Build these into a gravity turret.
Wield the gravity turret and use it to match the ducks by their color to the correct colored platform. Build the bricks that spill out into an electrical terminal.
Equip The Joker with his Electric Suit and locate the active electrical terminal along the back wall. Take the charge from it and use it to activate the inactive terminal that you just built.
Don’t forget to smash The Joker prop before moving on!
The Joker Smash Challenge: 1 / 3
Objective 2: Navigate the Fun House
Charging the terminal causes the fun house to spring to life! As The Flash, wall jump between the nearby walls that are slamming together. Don’t get squished!
After the wall jump, smash The Joker prop before ascending the set of trick stairs.
The Joker Smash Challenge: 2 / 3
Use The Flash’s super-speed to whiz by the giant boxing gloves. After you clear the gloves, jump onto the speed spot on the far right side. This causes you to be pushed through the wall to a bounce house below.
Just past the Ferris wheel, smash the LEGO booth and build the bricks into a speed spot. Run on it to send the Ferris wheel cars flying every which way!
Objective 3: Send Up the Balloons
On the ground level, build a pile of LEGO bricks into a turret that sprays toxic goo. Aim the turret to shoot the giant LEGO Joker face in the mouth. This inflates three balloons with the noxious mixture.
Once the balloons have been filled, take aim at the target above the LEGO Joker’s hair. Hit it to send the balloons flying straight into Brainiac, knocking him out of the fight.