At the beginning you have to defeat the secretary. Use Superman to destroy gold contour of big "L" letter (picture) where your enemy is sitting.
When she falls on the ground wait until she stop firing (you can easily check this by looking on hearts under her small portrait - if they are red you can attack her) and attack her with Batman's rocket (picture). You must repeat all action two more times but this time you have to firstly eliminate all enemies which will attack you.
After fight move Superman to the green wall and link all red pipes (picture). Destroy all silver bricks on the first floor under the board and build a panel which will shows on the left wall. Pull the lever and move heroes to the elevator.
In the next location destroy bricks on the right side - use Batman to demolish silver one and Superman for gold. Use remaining bricks to build platform with electrical suit. Pass through kryptonite layer and deactivate electric device (picture).
Move right and use Superman to destroy gold bricks near the wall and use Batman to charge electric device (picture). After that return for the power suit and destroy silver brick on the wall and the second one which is higher on the conveyor belt. After explosion the kryptonite layer will disappear.
Continue to the right side. Use Superman to destroy golden grating and pull the gold handle. Get to the elevator. In the next area destroy golden grate on the left (picture) and build platform with sensor suit for Batman.
Activate invisibility, move toward valve under the camera, turn it and move to the button on the ground under the kryptonite layer (picture). Repeat that action (turn valve and press the button) a couple of times until robots will attack you. Take them down, pass through destroyed glass and get to the fan.
When you reach the top move to the right. After a while you will get to the acid container. Use Superman's laser to destroy all gold bricks on the top (picture). One of them is on the right side so you will have to fly to right side to destroy it. Destroy also green pipes standing between two acid containers.
To deactivate second container get to the top and pull the handle. Get down and pull lever (it will activate handle on the right side). Use it to get on the top with Batman. Move to the right, destroy local boxes and use bricks to build platform with bat suit. Jump onto the platform under kryptonite layer and use pistol on the blue wall (picture) to deactivate third container.
Move to the right and destroy green-yellow block (aim at the gold wall). Stand on the button which will show and when the floor elevates move Batman at its edge and fly on the second side of the pool.
Move toward blue door on the left (picture) and destroy them with pistol. Get inside the room and pull the lever which will deactivate kryptonite. Use Superman's laser on the gold wall on the right and move to the next location.
Eliminate opponents, move to the wall at the top of the stairs and switch all red gears. In the next room destroy machine at the centre of the room and build armchairs. Sit on one of them and you will start controlling big robot which will have to fight with mechanical enemy. Wait until opponents starts charge, quickly dodge and when he lost orientation attack him (picture). Repeat this tactic until opponent fall.
After fight leave the robot and move to the room on the right. Use Batman's pistol to destroy controls near doors (pictures), use Superman's laser on gold wall and at the end move to the tunnel.