Mega-Gangar/Flappy-Game ? reverse-engineered prompt

Build me a polished Flappy Bird style game in Flutter using Flame.

I want the classic tap to flap gameplay, smooth gravity and momentum, pipes that scroll across the screen, and clean collision detection so it feels fair. Please add a score counter, a game over screen, and a simple start screen with an easy way to restart. Include a settings screen where I can choose Easy, Normal, or Hard, and save that choice locally so it stays after closing the app.

Make it look nice too, with a cheerful background, smooth bird and pipe animations, and a clean UI that works well on different screen sizes. If it helps, look up the current Flutter and Flame docs online before you start, and make sure the project runs on the usual Flutter platforms.