Sure, here's a simple implementation of Tetris as a single HTML file using JavaScript. It uses pictograms to represent the Tetris blocks and is designed for smartphone operation:
To play the game, save this code as a `.html` file and open it in a web browser on your smartphone. The game should start immediately, and you can control the Tetris blocks using the arrow keys on your keyboard or by tapping the screen on your smartphone (if your smartphone supports it). Have fun playing Tetris!