Desktris is a DHTML implementation of Tetris. I wrote it to be used as an Active-Desktop item, so that when projects were compiling, I was on the phone, etc., there was a game to switch quickly to. As it was intended for this, it only runs on IE. There is only one piece of code that won't run on other browsers such as Opera: the keyhandler does not generate an event on a keypress. Obviously, this makes the game completely unusable on other browsers.

This version of Tetris features multiple levels, full scoring (including bonuses for getting 4-at-once drops), and support for fast-shift (holding down left/right cursor keys). I think that's pretty much all of the features of the original. It also had the Gameboy Tetris music at one point, but I thought I'd do everyone a favour and remove that.