Sure, here's a simple game implemented as a single HTML file using JavaScript. The game is designed for smartphone operation and uses pictograms. The goal of the game is to match pairs of identical pictograms within a certain time limit. Here's the code:
Pictogram Matching Game
Time left: 60 seconds
To play, simply copy this code into an HTML file and open it in a web browser on your smartphone. The game starts automatically and you need to find matching pairs of pictograms by clicking on the cards. The time limit is set to 60 seconds, and if you manage to match all the pairs within the given time, you win the game. Otherwise, it's game over. Enjoy!