Sure! Here is a simple implementation of the popular game "Flappy Bird" using HTML and JavaScript:
To play the game, you can copy and paste the above code into a new HTML file (e.g., `flappy_bird.html`). Save the file and open it in a web browser to start playing. The bird will automatically start moving downwards, and you can make it flap by pressing the spacebar. The objective is to navigate the bird through the gaps in the pipes without colliding with them. Every successfully passed pipe increments the score. The game ends when the bird collides with a pipe.