Flappy Bird was similar to other games Nguyen had released on mobile devices, games like Shuriken Block or Super Ball Juggling. The graphics played cute homage to retro sprite art, the gameplay was extremely simple and the difficulty was jacked up high, meaning games lasted just a few seconds.

The concept sounded almost too simple: Tap the screen to fly up, release to dive down, and maneuver through gaps in a series of green pipes clearly styled after those in the Super Mario series. The gaps were invitingly wide, many times the height of the bird. But because the bird moved so fast and dove up and down so quickly, making it through the gap without wiping out proved extremely challenging. Because you get just one point for each pipe cleared, your high score is likely to be in single digits, if not zero.
For months, Flappy Bird did about as well as Nguyen's other games, which is to say few had ever heard of it. In late October, he released a small update that fixed some bugs. A few days later, something changed – someone besides Nguyen sent the first tweet about the game.
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