Sure! Here's a simple implementation of a block breaker game in a single HTML file using JavaScript:
To play the game, simply open the HTML file in a web browser, and you'll be able to control the paddle using the right and left arrow keys (or using touch gestures on a smartphone). The goal is to break all the bricks using the ball bouncing off the paddle and walls. If the ball hits the bottom wall without being caught by the paddle, the game ends.