Sure! Here's an example of a simple multiplayer racing game implemented as a single HTML file using JavaScript. Please note that this is a basic implementation to give you an idea, and you can enhance it further based on your requirements.
This game allows two players to control their respective colored rectangles (blue and red) using arrow keys and the "a" and "d" keys. The goal is to reach the end of the track without colliding with the track boundaries. The first player to reach the end wins. Each player is represented by a simple rectangle on the canvas.
You can further enhance this game by adding features like score tracking, multiplayer synchronization, graphics, sound effects, etc.