NSP files are a type of file used by the Nintendo Switch to distribute and install games and other content. NSP stands for "Nintendo Submission Package," and these files contain encrypted data that can be decrypted and installed on a Switch console.
Luigi's Mansion 3 is an action-adventure game developed by Next Level Games and published by Nintendo. It was released on October 31, 2019, for the Nintendo Switch. The game is the third installment in the Luigi's Mansion series, following Luigi's Mansion (2001) and Luigi's Mansion: Dark Moon (2013).
Luigi's Mansion 3 features a mix of exploration, puzzle-solving, and combat. Luigi must navigate through the haunted hotel, capture ghosts using the Poltergust G-00, and solve puzzles to progress through the game. The game also features a variety of power-ups and upgrades that Luigi can collect to enhance his abilities.