Hatsune Miku x TWICE「Doughnut AR」

 was an Augmented Reality mobile game that collaborated with Crypton Future Media & Hatsune Miku to promote the release of TWICE's Japanese single "Doughnut". It was released on December 16, 2021 and removed from the App Store and Google Play Store on January 1, 2022. The reason for it's removal is still unknown.

How It Works
If you bought a photocard for the single "Doughnut" by TWICE, you could scan it with the app to unlock exclusive material such as AR performances of the song by Miku and the members of TWICE, promotional photos and videos and a special Miku photocard created for the app gives you access to download a song called "When The Rain Falls" featuring Miku. The Miku photocard is still owned by some fans and is being sold for extremely high prices.

Status
Not a lot has been found to recover the game. The special Miku photocard is still available to buy on sites like eBay but the game itself hasn't been archived. Some content from the game was leaked onto Twitter and YouTube which may have been the reason why it was deleted. Another reason why it may have been deleted was because Crypton and JYP needed to focus on other projects and couldn't continue to update the app as stated in a reply to a tweet. The only archived content was the exclusive photos and videos and a screen recording of Miku's AR performance in the app. "When The Rain Falls" is yet to be found.