Sure! Here's an example of a simple platformer game implemented as a single HTML file, using JavaScript and enclosed in script tags. Please note that this is a basic implementation and can be further customized and enhanced:
To play the game, open the HTML file in a web browser (preferably on a smartphone-sized viewport) and use the arrow keys on your keyboard or arrow buttons on the screen (if available) to control the Lego character and navigate through the levels. Each world contains 8 levels, and you can switch between worlds by modifying the `currentWorld` variable in the JavaScript code.