League of Legends is a multiplayer online battle arena video game developed and created by Riot Games for Microsoft Windows and MAC OS X. It is a free to play game supported by micro-transactions. The game was first announced in October 7, 2008, but was later released in October 27, 2009. League of legends was generally well received at release, and has grown in popularity in the years since. League of Legends was the most played PC game in North America and Europe in terms of  the number of hours played.