Sure! Here's an example of a simple game implemented as a single HTML file with JavaScript. It uses pictograms for a better visual experience and assumes smartphone operation. Please note that this is a basic implementation for demonstration purposes and can be expanded upon to add more features as desired.
In this game, you will see four different smiley face pictograms represented by Unicode characters. Your goal is to select the smiley face that matches the randomly generated one. Each correct selection increases your score by 1, while each incorrect selection decreases your score by 1. The current score is displayed on the screen.
Please note that this is a basic example, and you can modify and enhance it further according to your requirements.