Sure, here's an example of a simple game implemented as a single HTML file, using JavaScript and enclosed in script tags:
This game displays a collection of shuffled pictograms represented by Unicode characters. When you click on a pictogram, it is revealed for a brief moment before disappearing. The objective is to match all the pictograms by revealing them one by one. Once all the pictograms are matched, an alert is shown indicating the completion of the game, and a new game starts automatically.
Please note that this is a basic implementation and you can enhance it further according to your specific game requirements.