Sure! Here's an example of a simple Battle Royale game implemented as a single HTML file with JavaScript. Please note that due to the limitations of this text-based interface, I won't be able to provide you with actual pictograms or smartphone-specific features, but you can certainly customize and enhance it further on your own.
Please note that this is just a basic template. You will need to add game logic, graphics, and implement various game elements such as player movement, gun mechanics, game modes, and skins. Also, make sure to replace the necessary parts of the code with actual functionalities and elements specific to your game design.