Sure, here's a simple implementation of a Sonic game using JavaScript in a single HTML file:
In this code, we first create an HTML canvas element and get its 2D rendering context. Then, we define a Sonic object with initial position, size, and speed.
Inside the game loop function, we move Sonic horizontally by updating its x-coordinate. We also clear the canvas and redraw Sonic using the updated position. Finally, we call the game loop again using `requestAnimationFrame` to create an animation loop.
This is just a minimal example to get you started with a Sonic game implementation. You can enhance it by adding more game elements, controls, levels, collisions, scoring, and more.