Sure! Here's an example of a Tetris game implemented as a single HTML file using JavaScript. Please note that this implementation might not fit within the 4 MB requirement as Tetris games typically require additional game assets. However, I'll provide a simplified version that only involves the core logic of the game.
Please note that this implementation only includes the basic mechanics of the Tetris game. You may need to further customize the design, controls, and additional features to suit your desired gameplay experience.