Objective 1: Explore the Armory’s Secrets
Head to the west and pass through the open door to enter the armory.
Once inside the armory, check the southeast corner of the room and build the bricks there into a small robot.
On the second floor of the armory, you find another set of bricks. Use either the grapple point or switch to Martian Manhunter to reach it.
The third and final set of bricks is on the west end of the catwalk. Build them to reveal a Token that when collected unlocks Deadshot.
Unlocked: Deadshot
Along the back wall, there is a wall plug that you can throw Robin’s baton into. Use the twirl poles to swing to a cage above the catwalk. Inside is a Token that unlocks Bane.
Unlocked: Bane
Back on the first floor, smash up the LEGO objects to find bricks to build an Attract Station, as well as the Attract pieces necessary to fill it. After you’ve collected 27 Attract pieces, deposit them into the Attract Station to reveal a LEGO crate. Smash the crate to reveal a Token that unlocks Green Arrow.
Unlocked: Green Arrow
On the south side of the armory, you find a large blue LEGO box and a gravity turret. Use the gravity turret to lift the box and reveal a small hole that holds a Token. Collect the Token to unlock Gorilla Grodd.
Unlocked: Gorilla Grodd
Objective 2: Open the Armory Door
Use the Gold Brick device in the center of the room to build a speed spot. Once the speed spot is built, switch to The Flash and have him run on it. Doing so charges the nearby electrical terminal.
Now that the electrical terminal is charged, switch to a character with an electricity suit. Discharge the electrical terminal and use the energy to charge the electrical terminal on the wall beside the nearby door.
Objective 3: Before leaving …
Before using the level pad to leave the Watchtower, make your way to the control room. Once there, charge the electrical terminal on the west side of the room. Once the terminal is charged, the large LEGO box nearby opens and a Token spills out. Collect the Token to unlock The Riddler.
Unlocked: The Riddler
When you’re ready to leave, head back to the armory and use the level pad to continue to the next level.