Sure! Here's a simple Battle Royale game implemented as a single HTML file using JavaScript. Please note that this is a basic implementation and not a complete game, but it should give you a starting point:
In this game, the `playerSkins` array defines the available skins for players, the `weaponSkins` array defines the available skins for weapons, and the `gameModes` array defines the available game modes.
Upon page load, the `startGame()` function is called which generates a set of random players and weapons and renders them on the game board.
Remember, this is just a basic example and you can expand on it to add game mechanics, interactivity, and further customization.