Maverick Bird is a Flappy Bird tribute by Terry Cavanagh (the maker of Hexagon). The bird is quite hard to distinguish and the pipes changed, but the spirit (and the difficulty level) of Flappy Bird were kept! You can fly up (with the up arrow key) and dive (with the down arrow key). Enjoy Maverick Bird (don't forget to listen to the music, which is great). If you like Maverick Bird you might also enjoy Delirious Bird.