Currently, when the server is under maintenance, the game shows a message prompt that shuts the game down when confirmed.
But the tutorial and challenge mode are fully local-run and don't require server resource, so it is possible (functionality wise) to allow player play those two modes when the server is under maintenance.
But the tutorial and challenge mode are fully local-run and don't require server resource, so it is possible (functionality wise) to allow player play those two modes when the server is under maintenance.