You can adjust a lot of things in your game.
1. distance between pipes.
2. Bird's Flying Speed.
3. Bird Falling Speed.
4. game scrolling speed.
5. Bird Flying by Tab or Touch.
6. offline Game Play
By adjusting it at different points, you can take the game to many different levels.

Flying Bird Fly Self Setting Game Classic & Modern

After loading the game, click on the play button