Sure, I can help you with that! Below is an example of a single HTML file that implements a simplified version of Atari Pong with three balls. The game can be played on all devices, including smartphones. I have used emojis as pictograms for simplicity, but you can replace them with any other pictograms as per your preference.
You can copy and save the above code into a single HTML file with a `.html` extension and open it in a web browser to play the game. The game canvas will adapt to the size of the browser window, making it suitable for all devices, including smartphones. Enjoy!