Sure! Here's a single HTML file implementing Tetris as a game using JavaScript. The game is designed for smartphone operation and uses pictograms.
To play the game, simply copy and paste the above code into a new HTML file (e.g., `tetris.html`) and open it in a web browser on your smartphone. The game should start automatically, and you can use the arrow keys to control the Tetrominos. The objective is to clear as many rows as possible to score points. Have fun playing Tetris!