Sure, here's an example of a simple game implemented as a single HTML file using JavaScript and enclosed in script tags. The game is designed for smartphone operation and uses pictograms.
In this game, there is a single pictogram (represented by the
📱 emoji) displayed on the screen. When the user taps/clicks on the pictogram, their score is increased by one and the updated score is shown on the screen.
You can play this game by opening the HTML file on a smartphone and tapping on the pictogram to increase your score. The current score is displayed above the pictogram.
Please note that this is a very basic example and can be expanded upon to add more features and complexity to the game.