Miitomo closes on May 9, 2018
The Miitomo smart-device app will be ending its service at 12 a.m. PT on May 9, 2018. Thank you to everyone who has supported Miitomo since its launch. My Nintendo members who have earned Miitomo Platinum Points may still redeem them for regular Platinum Point rewards* on My.Nintendo.com, even after the Miitomo service has ended. Remember, you can always check your points balance by signing in at My.Nintendo.com. For more information about using Miitomo Platinum Points once the app is no longer available, please visit our Customer Support site. And for more details about the end of the Miitomo service, please visit the Miitomo site.
…Wanna play? Buy a 3DS.
That being said, click on Miitomo for everything you need to know about the game. 😀