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 playable on a smartphone and uses pictograms.
This example creates a simple game where you are shown a random pictogram representing a fruit, and you have to answer whether it is indeed a fruit or not. The game keeps track of your score and presents a new question after each answer. The pictograms used can be replaced with any other suitable images you prefer.