This portion of the Luigi's Mansion 3 guide explains how to play 2 player co-op which you can only do after you unlock Gooigi. And so, this page also explains how to unlock Gooigi. Please note that ...

You can use the menu > E.Gadd hotline for hints at any time. If you stand still for long enough E.Gadd will give you hints, sometimes even polterpup shows up. You can expand the map, while still ...