Sludge Department is a single-player management, adventure, action, casual, graphic adventure, point-and-click, puzzle, hidden object, platformer, puzzle platformer, and simulation game in which players explore a mysterious underground facility through a series of intricate puzzles and interactions. In this game, players take on the role of a technician tasked with repairing a seemingly straightforward issue in a murky, underground sludge processing plant, only to uncover strange phenomena and bizarre characters as they delve deeper into the facility. It stands out with its unique blend of science fiction, horror, mystery, and dark comedy themes, featuring hand-drawn and stylized graphics in both 2D and 3D, along with multiple endings and a linear narrative that emphasizes investigation and puzzle-solving.