Sure! Here's an example of a game implemented as a single HTML file using JavaScript:
This game consists of a single HTML file with enclosed JavaScript code inside script tags. When the user clicks the green block in the middle, the game starts. It bounces for 10 seconds, and then the game prompt the player to either leave or press the block to stop.
If the player does not stop the game within 2 seconds, the game turns black and white every 1 second until the player interacts with the green block. If the player successfully stops the game by clicking the block, an alert message will show that they have won. If the player does not stop the game in time, a game over alert will be displayed.
Note: The game is designed for smartphone operation, and the gameplay can be experienced by opening the HTML file on a smartphone browser. Pictograms can be added as needed in the HTML or CSS styles.