Sure! Here's an example of a simple text-based adventure game implemented as a single HTML file with JavaScript code enclosed in script tags:
To play the game, simply open the HTML file in any web browser on your smartphone. You'll be prompted to enter your name, and then you can start playing by choosing different options presented to you.
The game involves exploring a forest and encountering various events like finding health potions or battling monsters. Your goal is to defeat the monster and win the game.
Please note that this is a very basic example and you can expand and enhance it further based on your requirements.