Sure, I can provide you with a simple text-based gun game implemented as a single HTML file. Here's an example:
Gun Game
This code sets up a basic gun game using JavaScript within the HTML file. It keeps track of the player's ammo and the number of enemies remaining. The player can shoot by clicking a button (not shown in the code). The game displays messages on the screen to notify the player of their status. You can further enhance this game by adding graphical elements or more complex gameplay mechanics.