Sure! Here's an example of a simple Plants vs Zombies game implemented as a single HTML file using JavaScript:
This HTML file implements the basic game mechanics, where plants and zombies are randomly placed on a game board represented by a grid. The plants and zombies have a health value that decreases over time, and when their health reaches zero, they are removed from the board.
Please note that this is a simplified implementation and lacks many features that a full-fledged game like Plants vs Zombies would have. However, it should give you a starting point to build upon. Feel free to modify and enhance the code as per your requirements.