Bentley: My paranormal scanner is maxing out on that structure.
Sly: A reading like that could only be coming off of Mz. Ruby herself.
— Bentley and Sly deducing Mz. Ruby's position
"The Swamp's Dark Center" was a job and the main hub in Episode 3: Vicious Voodoo of Sly Cooper and the Thievius Raccoonus. From here, Sly can explore other levels in Mz. Ruby's swamp and put a stop to her devilish schemes to create an army of ghosts and conquer all of Mexico. Sly could also infiltrate the Ghost Production Facility and the Skull Temple from here.