We finally have some gameplay for the upcoming sequel Luigi's Mansion 3, and a few of the key gameplay features have been revealed.
First of all it's not set in a mansion at all, but rather a creepy old hotel that some major Mario characters are invited too. Gameplay seems to be largely the same, involving fighting off ghosts using an upgraded vacuum cleaner, the Poltergust G-00. We also know that Luigi can spawn a gooey clone of himself, Gooigi, and the player can swap between both characters in order to solve more complicated puzzles. On top of everything else there's even co-op now!
See the trailer for yourself above!