The Poltergust 3000 is a fictional vacuum-like device featured in the video game series Luigi's Mansion. It is primarily used by the character Luigi to capture and contain ghosts. The device has a powerful suction mechanism that allows it to pull in spectral entities and other objects, making it essential for ghost hunting. Equipped with various features, the Poltergust 3000 also includes a flashlight to reveal hidden ghosts and a special function to shoot captured ghosts back out. This unique gadget plays a crucial role in the gameplay, helping players navigate haunted locations and solve puzzles throughout the game.