Please journal comments here.
There is now a how to play page linked from the main page.
Note: requires java 5. If you don't have Java 5 installed and usable from your browser, you'll get a class loader error in your java console, or an applet loading failure. I'm interested in pretty much any other bug reports, as there is nothing I can do about how Sun handles these errors (I've had no error reports so far that did not trace back to not having Java 5 installed & set up to be used from the browser).