Sure! Here's a simple text-based Battle Royale game implemented as a single HTML file using JavaScript:
Battle Royale Game
This HTML file contains a basic Battle Royale game where the player and an enemy have 100 health points each. The player can initiate an attack by clicking the "Attack" button, and random attack values are deducted from each player's health. The game continues until either the player or the enemy has health points below or equal to 0. Once the game ends, the result (draw, win, or loss) is displayed on the screen.
Please note that this is a very simple implementation, and for a more complex and visually appealing game, additional CSS and images/pictograms can be added. But this should give you a starting point for a basic Battle Royale game.