Sure! Here's an example of a simple Flappy Bird game implemented as a single HTML file using JavaScript:
To play the game, save the above code as an HTML file (e.g., flappybird.html), and then open it in your browser. The game should start automatically. Use the Spacebar key or tap on the screen to make the bird jump and avoid the pipe obstacles. Your score will increase as you successfully navigate through the pipes, and the game will end if the bird hits the ground or a pipe.
Please note that this is a simplified implementation of Flappy Bird game and may not include all the features found in the original game. You can add more advanced features and stylizations as per your requirement.