fly and avoid tree trunks. If you bump into a tree, you come crashing down and have to start again.
One of the differences in Tappy Chicken with respect to the original game is that every time the bird hits the ground, it drops a colored egg. You can try to collect the more than 60 different eggs that exist in the game, but to do so, you'll need to play a lot.
Tappy Chicken is an improved version of Flappy Bird, with slightly improved graphics and a little bit simpler gameplay. Even so, it's a game that takes a lot of practice to master.