Sure, here's a simple implementation of Flappy Bird as a single HTML file using JavaScript and pictograms. Please note that this implementation may not include all the features and complexities of the original game, but it should provide you with a basic playable version.
To play the game, simply open the HTML file on a smartphone device or emulator. Tap the screen to make the bird jump and avoid the pipes. The goal is to pass through as many pipes as possible without colliding.