Sure! Here's an example of a simple Flappy Bird game implemented as a single HTML file using JavaScript:
You can copy this code into a single HTML file and open it in a browser to play the Flappy Bird game. The game will run in a canvas element, and you can control the bird by tapping on the screen (for smartphones) or by pressing any key on your keyboard. The objective is to navigate the bird through the gaps in the pipes to score points. If the bird collides with a pipe or the ground, the game is over, and you can tap the screen again to play again.