Sure! Here's an example of a simple game where you can fight other players one-on-one, and the strength of each body part increases as you use it while the defense increases as it gets hit. The game will be played on a smartphone, and I'll use pictograms to represent the body parts.
Remember, you need to save the code in a single HTML file and enclose the JavaScript within script tags. Here's the code:
One-on-One Fighter
To play the game, open the HTML file on a smartphone. You will see your body parts (represented by pictograms) and the battle arena with the opponent's body parts. Simply click on any of your body parts to attack the corresponding body part of the opponent. The strength of each body part will increase as you use it, and the defense of the opponent's body part will increase when it gets hit. Keep attacking until you defeat all the opponent's body parts. Once the battle is finished, a victory message will be displayed.
Please note that this is just a simple example to demonstrate the concept. You can further enhance the game by adding features like special attacks, multiple opponents, and more.