Sure! Here's the implementation of a simple battle royale game using JavaScript and HTML:
This is a basic outline of a battle royale game using JavaScript and HTML. Since you mentioned smartphone operation, the game canvas is set to fit a smartphone screen (480x320). The game loop continuously updates the canvas, clears it, and redraws the player character.
Please note that this is a very basic implementation and doesn't include all the features of a complete battle royale game like Free Fire. You can build upon this foundation by adding more game objects, controls, enemies, weapons, etc., to create a more engaging and dynamic experience.