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The Lord of the Rings Online (previously titled The Lord of the Rings Online: Shadows of Angmar) is a massively multiplayer online role-playing game (MMORPG) for Microsoft Windows and OS X set in J. R. R. Tolkien's Middle-earth, taking place during the time period of The Lord of the Rings. Developed by Turbine, Inc., the game launched in North America, Australia, Japan, and Europe in April 2007 as The Lord of the Rings Online: Shadows of Angmar. Players could create characters of four races and seven classes and adventure throughout the region of Eriador. In November 2008, Mines of Moria expansion was released, adding the region of Moria and two new playable classes. It was followed by the Siege of Mirkwood in December 2009. In 2010 the game underwent a shift from its original subscription-based payment model to being free-to-play, with a paid subscription and an in-game store.

The game saw continued development, alternating between paid expansions and free updates, which added new content in the regions of Isengard, Rohan and Gondor. In late 2016 it was announced that the publishing of the game would transfer from Warner Bros. Interactive Entertainment to Daybreak Game Company, with development being taken over by Standing Stone Games, made up of former Turbine staff. The game development continued and in 2017 the Mordor expansion was released, bringing the main storyline to a close. The story then shifted to showing how various inhabitants of Middle-earth deal with the downfall of Sauron, with Minas Morgul expansion released in 2019 and a Gundabad-themed expansion announced for 2021.