Most of the time this is the symptom of the Java applet plug-in being disabled in your Web browser or in your system.
Since the latest Java update on Mac OS X, Apple disabled "Java Applets" in Safari, preventing our Web games to launch.
It is also possible that Java applets are disabled globally. Please check in "/Applications/Utilities/Java Preferences" the status of the "Enable Java Applets" check box.
Since security update "Java for OS X 2012-006" on Mac OS X "Lion" and "Mountain Lion", Apple Java plug-in has been uninstalled. To use our Web games, click on the region labeled "Missing plug-in" to download the latest version of the Java applet plug-in from Oracle.
It is recommended to install the latest java version.
Then check that your browser allows Java Applets to run or that the Java applet plugin is allowed to run (see below).
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