While maintenance mode is on, only sbpaul@hotmail.com can log in. Everyone else sees your message below (100 characters max; empty = "Site under maintenance. Please check back later.") and is signed back out immediately.

Shows a banner at the top of every game in progress (100 characters max). It stays up for 2 minutes or until they close it; anyone opening a table within 10 minutes of sending still sees it.

New signups start as Pending and can't log in until approved here. Disabling an account blocks that person from logging in going forward. Neither action deletes their Firebase account - to permanently remove it, do that manually in the Firebase Console > Authentication.