Flappy Bird at one point was reportedly bringing in tens of thousands of dollars in ad revenue per day. By February 2014, however, Nguyen had completely removed the game from all mobile app stores.

Flappy Bird is back!Watch on YouTube. The game's return is thanks to the Flappy Bird Foundation, a team of fans "committed to sharing the game with the world".

Flappy Bird debuted in May 2013 but it didn't blow up until the following January. Developer Dong Nguyen soon revealed that the game was raking in $50,000 per day from advertising.

Flappy Bird set the bar (or rather pipes, placed randomly) for mobile game simplicity. Between that and its bizarrely high level of difficulty, it created a devilish blend of game-playing ...