Certainly! Here's a basic implementation of Tetris as a single HTML file using JavaScript:
This implementation creates a simple Tetris game where the user can control the tetromino using the arrow keys on a smartphone. The tetromino is represented by red blocks on a canvas, and the player can move the tetromino left, right, down, or rotate it using the arrow keys.
Note: This is a basic implementation and does not include features like scoring, levels, or game over conditions. It serves as a starting point for creating a more complete Tetris game.