The 2019 championship had over 100 million unique viewers, peaking at a concurrent viewership of 44 million. The domestic leagues culminate in the annual League of Legends World Championship. The game is often cited as the world's largest esport, with an international competitive scene composed of 12 leagues. A massively multiplayer online role-playing game based on the property is in development. Its success has also spawned several spin-off video games, including a mobile version and a digital collectible card game. In 2019, the game regularly peaked at eight million concurrent players, and its popularity has led to tie-ins such as music videos, comic books, short stories, and an animated series. The negative and abusive in-game behavior of its players, criticized since early in the game's lifetime, persists despite Riot's attempts to fix the problem. The game's long lifespan has resulted in a critical reappraisal, with reviews trending positively. League of Legends received generally positive reviews critics highlighted its accessibility, character designs, and production value. 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. During a match, champions become more powerful by collecting experience points, earning gold, and purchasing items to defeat the opposing team. Each of the ten players controls a character, known as a 'champion', with unique abilities and differing styles of play. In the game, two teams of five players battle in player versus player combat, each team occupying and defending their half of the map. The game is available for Microsoft Windows and macOS. Since its release in October 2009, the game has been free-to-play and is monetized through purchasable character customization.

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. League of Legends ( LoL), commonly referred to as League, is a 2009 multiplayer online battle arena video game developed and published by Riot Games.

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