The Batcave serves as Batman's command center, where he monitors all crisis points in Gotham and the world.
The cave's centerpiece is a supercomputer whose specs are on par with any of those used by leading national security agencies; it permits global surveillance and also connects to a massive information network as well as storing vast amounts of information, both on Batman's foes and his allies. The cave contains state of the art facilities such as: crime lab, various specialized laboratories, mechanized workshops, personal gymnasium, a vast library, parking, docking and hangar space (as appropriate) for his various vehicles as well as separate exits for the various types, trophies of past cases, a large bat colony, and a Justice League teleporter. It also has medical facilities as well as various areas used in training exercises for Batman and his allies. It also contains a large number of glass cases that serve as display for the many Batsuits and other uniforms of past and present members of the Bat Family and houses Batman's vast array of specialized vehicles, foremost being the famous Batmobile in all its incarnations.
To get this brick you need to solve a Chroma puzzle to open a vault. To get the yellow platform you need a character with Illumination Ability and to get the blue one you need a character with Relic Detection Ability. Once you do this activate the keystone and solve the puzzle, the colours are Red at the top, Blue on the left and yellow on the right.