Sure! Here's an example of a simple rhythm game in HTML using JavaScript. You can copy and paste the code into a single HTML file and run it in your browser. This game uses pictograms for notes and arrows, and it involves a rap battle with competitors. The game starts as soon as you load the HTML file.
Timer: 30 seconds
Score: 0
This is a simple implementation, and you can customize it further based on your specific game requirements. The game allows you to hit the notes using mouse clicks. You can extend the game logic, add sounds, and improve the graphics as desired.