As a language model AI, I can provide you with an example of a simple game implemented as a single HTML file with JavaScript. Please note that this is just a basic sample and can be enhanced further based on specific requirements.
Here's the HTML code:
In this example, the game starts when the document is loaded (`DOMContentLoaded` event). It displays a message to the player with instructions. Then, it starts a timer that updates every second and calls the `updateTimer` function. The `displayPictogram` function selects a random pictogram from an array and displays it on the screen.
Every time the player taps/clicks on the pictogram, the score is incremented, and a new pictogram is displayed. If the timer reaches 0, the game ends, and the final score is shown.
Feel free to modify this code snippet as needed to fit your specific game requirements.