League of Legends (LoL), commonly referred to as League, is a 2009 multiplayer online battle arena video game developed and published by Riot Games. Inspired by Defense of the Ancients, a custom map for Warcraft III, Riot’s founders sought to develop a stand-alone game in the same genre. Since its release in October 2009, the game has been free-to-play and is monetized through purchasable character customization. The game is available for Microsoft Windows and macOS. In the game, two teams of five players battle in player versus player combat, each team occupying and defending their half of the map. Each of the ten players controls a character, known as a “champion”, with unique abilities and differing styles of play. During a match, champions become more powerful by collecting experience points, earning gold, and purchasing items to defeat the opposing team. In the game’s main mode, Summoner’s Rift, a team wins by pushing through to the enemy base and destroying their “Nexus”, a large structure located within.