Sure! Here's an example of a simple game implemented as a single HTML file with JavaScript. The game is called "PictoMatch" and it's a matching game where players need to match pairs of pictograms within a time limit.
PictoMatch
To play the game, open the HTML file on your smartphone's web browser. The game will display a grid of cards with pictograms. Tap on a card to flip it. The objective is to match pairs of cards with the same pictogram. The game provides a timer for added challenge, and the score increases with each successful match. The game ends when either the time runs out or all pairs are matched. Enjoy playing "PictoMatch"!