The first 'Luigi's Mansion 3' multiplayer DLC pack is now available
 

Late last year, Nintendo announced that it's releasing two DLCs for Luigi's Mansion 3, which will add multiplayer features to the action-adventure game. It promised to release the first of the two by April 30th, 2020, but it looks like you don't have...

https://www.engadget.com/2020/03/04/...n-multiplayer/