Expect some downtime.
If you’re planning on playing some multiplayer on your favorite Nintendo device today, you may want to make some alternate plans as the Nintendo Network will be down for extended maintenance.
The Nintendo Network maintenance is planned for 8 AM Pacific Time on Monday September 30 and will go until 5 AM Pacific Time Tuesday. Nintendo have detailed the services affected via a post on the Miiverse:
During this time, some Miiverse features will be temporarily unavailable (including private messages, friend requests and your blocked-user list). Any online features in games may also be affected by this maintenance. If you are playing online when the maintenance starts, please be aware that you may be disconnected at any time during the maintenance hours. We apologise for any inconvenience. Please let us also take this opportunity to inform you that scheduled maintenance takes place every Monday. During this time, some Nintendo Network services may be unavailable.
Well, Wii U and 3DS users, what are you going to do all day?