Sure! Here's an example of a simple Tetris game implemented in a single HTML file using JavaScript. Please note that due to the complexity of Tetris, the implementation provided here is a simplified version.
This implementation creates a simple HTML page with a game board represented by a `<div>` element. Each cell of the game board is drawn using CSS and represented by a `<div>` element with the `cell` class. The game logic, including generating shapes, moving them, and checking for collisions, is implemented using JavaScript.
Please note that this is just a simplified implementation to demonstrate the concept. In an actual game, you would need more advanced features, such as score tracking, level progression, and more complex shapes.