Quick Shortcut
Do you remember the door right outside Biff Atlas' door, the one that you aren't able to unlock? Well, there is in fact a way to open the door. If you go into Biff Atlas' room (it is not necessary to have beaten him to do this, so if he is still there it makes no difference) and run on the treadmill on the west side of the moon. After walking on it for a few seconds, a key will pop out. This is the key to the door.
More tricks, tips and cheats for this game are right here - Luigis Mansion cheats
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