Improved styling and functionality.
Original Readme:
JS Tetris is a browser based clone of one of the greatest puzzle video games of all time. JS Tetris is a BSD-licensed open source project founded by Czarek Tomczak (see my Resume) in 2004. To play the game you only need to have javascript enabled in your browser, there are no plugins required (no java, no flush). You are free to put Js Tetris on your website and to modify the game. The rules are simple: move and rotate the blocks with the aim of creating a horizontal line of blocks without gaps. Use arrows and spacebar to navigate blocks.
A browser version of game is available. To run it, extract the zip file and open tetris.html in your browser. Download it from the Releases page.
The game author's (Czarek) personal best is 332 lines, see screenshot below.