Sure! Here's an example of a simple Block Breaker game implemented in a single HTML file using JavaScript:
Save the above code in a single HTML file (e.g., `block_breaker.html`), and when you open this file in a web browser, it will present you with a Block Breaker game interface. You can control the paddle using the left and right arrow keys on your smartphone. The objective is to break all the bricks by bouncing the ball off the paddle. If the ball touches the bottom edge, the game will end, and an alert box will appear with the message "GAME OVER." You can then reload the page to start a new game.
Note: Since the implementation requires using the `<canvas>` element, it may not have perfect responsiveness for all smartphone screen sizes. You may need to adjust the canvas size and paddle speed for optimal gameplay experience on different devices.