The app generated $50,000 in advertising revenue daily, according to The Verge, and Reuters reported that the Android version of the game was downloaded more than 50 million times.
"Flappy Bird," which resembled "Super Mario," had a simple design.
(Read more: Popular game 'Flappy Bird' flies no more)
"When people see a simple game, they expect [it] to be easy," said Max Eddy, junior software analyst at PCMag.com. " 'Flappy Bird' looked simple but was brutally, punishingly difficult. I think that threw people for a loop, and they didn't want to be defeated by something so basic."
Ha was "unhappy with the coverage he'd received and was pulling the game," Eddy said. "Given that backdrop, a sequel seems unlikely."
It can no longer be downloaded, but mobile users with the game already installed on their devices will still be able to play it.
Since app stores' withdrawal of the product, eBay sellers have offered phones and tablets with "Flappy Bird" installed at prices of $5,000 or more.
—By CNBC's Althea Chang