If you haven't already downloaded the addictive and much-hyped Flappy Bird mobile game for iOS or Android, you're out of luck.

Creator Dong Nguyen officially pulled the app from Apple's App Store and Android's Google Play platform, saying he could no longer handle the pressure and stress following its instant success.

See also: The 10 Best Mobile Games of 2013

On Saturday, Nguyen sent a series of tweets warning that he was going to remove the app in just 22 hours. Fans pleaded with him to keep it available, but by Sunday at 12 p.m. ET, the app was no longer downloadable.

I am sorry 'Flappy Bird' users, 22 hours from now, I will take 'Flappy Bird' down. I cannot take this anymore.

— Dong Nguyen (@dongatory) February 8, 2014

It is not anything related to legal issues. I just cannot keep it anymore.

— Dong Nguyen (@dongatory) February 8, 2014

Press people are overrating the success of my games. It is something I never want. Please give me peace.

— Dong Nguyen (@dongatory) February 4, 2014

Users who already have the game will still be able to play it.

The reaction to the news has not been positive. In fact, some fans have even threatened to kill the creator or even themselves if the app isn't restored.

Fans of the 'Flappy Bird' app are threatening to kill its creator or themselves now that app is no longer available: https://t.co/SlGrGcxMkv

— Eli Langer (@EliLanger) February 9, 2014

Although the app launched in May 2013, it became an overnight sensation this week as it climbed to the top free app in Apple's App Store and Google Play for Android. The game was reportedly bringing in about $55,000 in ad revenue.

Perhaps the app went viral because it is so frustrating play. The concept of the game is to keep a bird afloat by tapping it through a series of obstacles. The game is designed to be simple, but the task is extremely difficult.

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This article originally appeared on Mashable.