RuneScape (RS) is the world's largest free massively multiplayer online role-playing game (MMORPG). It is created by Jagex Ltd and written in Java, although a HTML5 version of the game is also available on Microsoft Windows operating systems (MSW-OS). It is usually accessed via one of the following:
Opening http://www.runescape.com/game.ws in a Java-supporting web browser (e.g., Firefox, Epiphany or Opera). On Ubuntu this method requires that you have the IcedTea Java plugin installed. This Java guide for Ubuntu users on the Community Help Wiki may help, if any issues are encountered while installing this plugin.
Running the RuneScape official client. This option is only available for those running on OS X and MSW-OS. For Linux users there is an unofficial client, the RuneScape Unix Client, which may be installed on Ubuntu by running the following commands from the command line:
sudo add-apt-repository ppa:hikariknight/unix-runescape-client sudo apt-get update sudo apt-get install unix-runescape-client
providing the root password when prompted, of course.