Sure! Here's a Tetris game implemented as a single HTML file using JavaScript. The game is designed to be played on a smartphone and uses pictograms for better visualization. Please note that due to platform limitations, the game might not work perfectly in this text-based interface.
To play the game, you can copy the above code and save it as an HTML file (e.g., tetris.html). Then, open the file in a web browser on your smartphone. You can control the game using the arrow keys to move the pieces and the up arrow key to rotate them. The objective is to fill rows with blocks to score points and prevent them from reaching the top of the screen. Enjoy the game!