Sure! Here's a simple implementation of Tetris as a single HTML file using JavaScript:
This implementation creates a simple game board using a `<div>` element and represents blocks as colored squares using CSS. The game logic is written in JavaScript enclosed in `
` tags. The script handles user input, moves the blocks, checks for completed rows, and updates the game board accordingly.
You can play the game by opening the HTML file in a web browser on your smartphone. You can use arrow keys (or swipe gestures if you are running it on your smartphone) to move and rotate the blocks. The game will continuously spawn and move down blocks, and you need to clear as many rows as possible by forming complete horizontal lines.
Note: This implementation is a basic version of Tetris, and you can extend it further by adding features like scoring, levels, and more complex block shapes.