Secret Areas are rooms that require a certain ability to access. There is one such area in almost every level, about 4 minikits in each, and a Citizen in Peril in some.
To access the area, find a hacking terminal on the left of Mr. Burns' Office and use it to find a bunch of bricks to build a TARDIS stand to the secret area.
To access it, use Fix-It on blue bricks in the anti gravity room. The Pandorica will appear to use Magic on for bricks to build a TARDIS Stand to the secret area.
Instead of going to the shortcut room with Wheatley in test chamber 05, use Chell's Portal Gun at the end of test chamber 05 to access test chambers 06, 07, and 08.
After the scene with the Ecto-1, go left and find a Spinjitzu Switch. Use it to go to a harbor and use the 3 starter abilities to make a bell ring, and a ghost Titanic will appear. Inside, you can use the DeLorean Time Machine to go back in time to when everyone was alive.
In the top left corner of Foundation Prime, there is a towable wall. Pull down the wall to access a room with a broken gateway. Find the missing parts and use Rainbow Build to fix the gateway and enter it.
During the section you are plugging in cables, blow up a silver bin to reveal a Locate Keystone . Use it to summon Homer in the Mr. Plow truck to destroy a fence. Go through.
As soon as you are in the second testing chamber, you can solve a puzzle far right, with Laser Deflection and X-Ray. It will open a door you can go through.
During the fight with Gozer, use Relic Detector and reveal a Laser Deflector circle and Terror Dogs . Reflect the Terror Dog lasers back at them to open a portal to Dana's Apartment.
After landing on the temple, go to the left side of the temple where you find the Monster and a red wall. Use Diffindo to cut the red wall and rebuild it into fireworks to make the Monster open its mouth, then jump in.
To get to this secret area, destroy nearby objects in the first room inside the CIA Headquarters and use the pieces to build onto the sliding track. Once that is done, push the vending machine to the end which will reveal a vent. Finally, use characters with Slurp Access to pass through the vent.
During the Labyrinth Zone section, go to the area where you will find the Scale keystone activator and active the Keystone. Then continue the level until you get out of water with the moving platform.
There will be a tunnel on your left. Shrink down using Scale and go through the tunnel to reach another area with Gold LEGO Objects. Use a character with the Laser Ability to destroy and rebuild them as a portal to the secret area.
When fighting Rowan, use the Portal Gun to shoot at the portal pad at the entrance and another inside the cage, allowing you to access the rift inside the cage.
During the Niffler Basement Chase, approach the Sword Switch and use a character with the Sword Switch Ability to activate a portal in a bank vault. Jump into the portal to enter the location.
Before capturing Dougal, destroy the panel which will reveal an electrical circuit. Use Ethan Hunt's Fuse Box Ability to intercept it and activate the elevator. Once the elevator is opened, use the TARDIS to activate the TARDIS Pad and travel to the location.
To the right of the laser deflection needed to get in to the centre of the Fortress is a Special Fuse Box. Use Ethan Hunt to blow the fuse and disable the laser bars.
When navigating the gravitational maze, you will see a Silver LEGO Groundpiece near the end of the level. Use a character with the Silver LEGO Blowup ability to break it and reveal a portal in the floor. Walk in it to fall through to another area.
Trivia[]
The GSA base found in All Your Bricks Are Belong To Us is from Defender 3D (aka, Defender 2002). It has the same features as it did in the game, as well as the spaceships.
The date to get there is September 27th, 2015. This is the date LEGO Dimensions released in the U.S.
This has been confirmed in a retweet by the LEGO Dimensions Twitter account.
The only levels to not have a secret area are all Story Pack levels.
