JETRIS is ...
A Java based Tetris clone. It can be played online as Java applet or as a standalone desktop game. Jetris is focused on a fast gaming, so a game usually takes about 15 min. You can post your HiScore online.
JETRIS is written in JAVA programming language, this means that it can be run on any Operating System which has JAVA Runtime Environment (JRE). You need JRE 1.5.0 (also know as JRE 5) or above. You can download JRE for free at www.java.com