I tried 3 random games (on firefox) and couldn't play any of them, I think it may be because I do not have Java 6 because I am still on Tiger. It gives me these errors "load: class AppletGui not found. java.lang.ClassNotFoundException: AppletGui" and "Caused by: java.io.IOException: open HTTP connection failed." (with all of the line numbers that caused the errors) and same thing happens in Safari. Try updating to Java 6 if it gives you that option, and I would presume it would become default, but you can use Java Preferences (Applications>Utilities>Java) to make sure.