Sure! Here's an example of a Flappy Bird game implemented as a single HTML file using JavaScript:
To play the game, simply open the HTML file in a web browser. The game will run on both desktop and smartphone browsers. You can control the bird's movement by clicking/tapping to make it jump over the gaps between the pipes. The goal is to survive as long as possible by avoiding collision with the pipes and earn points by passing through the gaps.
Note: This implementation is a simplified version of Flappy Bird and may not include all features present in the original game.