Sure! Here's an example of a simple game called "FNF Duet Pets" implemented as a single HTML file with JavaScript, using pictograms and designed for smartphone operation:
FNF Duet Pets
When you open this HTML file in a web browser, it will display a game board with various pictograms represented as pets. By tapping on each pet, it will disappear, and the goal is to make all the pets disappear by matching them. Once all the pets are hidden, an alert will be displayed congratulating the player on finishing the game.
Feel free to modify and improve this game based on your preferences!