Sure! Here's an example of a simple game implemented as a single HTML file using JavaScript:
Pen Dig Game
Click on the pen to dig!
Score: 0
In this game, you need to click on the pen to dig. Each time you click on the pen, your score increases by 1. The pen's position is randomized after each click. To prevent continuous clicking, there is a one-second delay before the pen can be clicked again. The current score is displayed on the screen. The game is designed to be played on a smartphone, and you can add pictograms or icons as needed.