The lights are on
The Nintendo Network goes down for planned maintenance every week, but this week the downtime is longer and effects more Nintendo online services.
From 8 AM Pacific Time on Monday September 30 to 5 AM Pacific Time, online multiplayer, online rankings, private messages, friend requests, blocked-user lists, and other services will be down or sporadically available.
For more on the down the planned downtime, you can check out Nintendo's website, or this official Miiverse posting.
[Source: Miiverse, Nintendo]
Our TakeThe Internet rumblings surrounding the downtime presume preparations for larger firmware updates soon coming to Wii U and 3DS. This seems very likely, but Nintendo hasn't confirmed any dates for upcoming updates.
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