Sure! Here's an example of a game with 1,000 bouncing squares inside one enormous box using JavaScript. It utilizes the HTML5 canvas element to draw the squares and animate them. You can copy the code into a single HTML file and run it in a web browser.
When you open this HTML file in a web browser (preferably on a smartphone), you will see 1,000 bouncing squares inside an enormous box represented by the browser viewport. Each square will have a random size and velocity, and they will continuously bounce around the box. You can play the game by observing the bouncing squares.