HANOI (Reuters): The developer of Flappy Bird, the former most popular free mobile game on the Apple Inc App Store and Google Inc’s Android Play store, took the game down at midnight on Sunday as he announced he would do 22 hours earlier. The game is no longer available to download for either Apple or Google users, but its fans still can have fun with the bird if they already downloaded the game to their devices.

Nguyen Ha Dong, a Hanoi-based game developer, announced the grounding of the addictive game in a Tweet at 1900 GMT on Saturday in which he also apologized to Flappy Bird players.

“Twenty-two hours from now, I will take ‘Flappy Bird’ down,” Dong said, adding “it is not anything related to legal issues. “I cannot take this anymore,” he wrote. His Tweet attracted more than 136,000 Retweets as of 0430 GMT on Monday. Flappy Bird caused a sensation after rising from obscurity to become one of the most downloaded mobile games on both Apple and Google’s online stores. Users have to steer a bird between green pipes. The Android version has been downloaded up to 50 million times and attracted more than half a million reviews. Many people have been questioning Dong on Twitter about his decision to take down the game as only a day earlier he had been talking about developing the game for Microsoft’s Windows phones. Dong could not be reached for comment. He turned his telephone off after cancelling an interview with Reuters on Thursday and not finalizing arrangements for one on Friday. a