Sure! Here's an example of a simple "Call of Duty" game implemented as a single HTML file using JavaScript. Please note that this is a very basic version, and you can enhance it further as per your requirements.
Call of Duty Stick Figures
In this game, you have a game board with stick figure characters representing players and enemies. The player can shoot at the enemies using the spacebar key. When the player shoots, the enemies briefly turn red to indicate they've been hit by a bullet.
Please note that this is a basic demonstration and does not include more advanced game modes, scoring, or other features usually found in Call of Duty games. It can serve as a starting point for further development.