It also seems to work with Chromium.  And so I expect it would work with Google Chrome too.

The games seem to be flash, so it doesn't really matter what browser people use does it?

If I log in, then go to the rules, can I get back to the games without having to log in again?  Each time I click "play now" it asks me for my password, and a "Turing Number" (which is an odd term for it which may confuse some players).  I don't want to have to keep re-logging in over and over.