League of Legends Trailer Informs, Entertains, Excites

League of Legends' gameplay and the newfangled 'MOBA' genre--multiplayer online battle arena, acronym addicts--are explained by the Riot Games team in a new trailer.

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Beta signups are currently open for LoL, which was inspired by popular Warcraft III custom level Defense of the Ancients and boasts a former DotA developer on its team.

League of Legends will be free to play when it arrives on PC in September, supported by micropayments for additional customisation options and a retail Collector's Edition.