Windows XP or later, or Mac OS X 10.4 or later Screen resolution: 1024 x 768 or higher Broadband Internet connection Browser: Safari 4 or later, IE 7 or later, Firefox 3 or later, or Chrome Flash Player 9 or later Unity Web Plugin (free), version 3.4 or later Speakers or headphones (recommended)

Using most recent version of Firefox is recommended.

(The current version will not work on Chromebooks, because ChromeOS no longer supports the Plugin. Currently, it is not designed for tablet use.)