Sure! Here's a simple implementation of a block breaker game written in a single HTML file with JavaScript:
This code sets up a canvas element and implements the necessary game logic for a block breaker game. The user can control the paddle using arrow keys or touch gestures on a smartphone. The objective is to bounce the ball off the paddle and break all the bricks using the ball.
Please note that this is a basic implementation and can be enhanced with additional features, levels, scoring, etc., depending on your requirements.