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League of Legends (LoL) is a multiplayer online battle arena video game developed and published by Riot Games for Microsoft Windows and Mac OS X, inspired by the mod Defense of the Ancients for the video game Warcraft III: The Frozen Throne. It is afree-to-play game, supported by micro-transactions. The game was first announced on October 7, 2008, and released on October 27, 2009. League of Legends was generally well received at release, and has grown in popularity in the years since. According to a 2012 Forbes article, League of Legends was the most played PC game in North America and Europe in terms of the number of hours played. As of January 2014, over 67 million people play League of Legends per month, 27 million per day, and over 7.5 million concurrently during peak hours.

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Game modes and matchmaking

League of Legends is a session-based game. Matchmaking creates teams with even average Matchmaking Rating (MMR) of the constituent players. MMR uses the Elo formulawith proprietary adjustments.

  • Tutorial mode is a set of two introductory sessions that teach the basics of the game. It is intended to help new players learn concepts such as the controls and the game'sHUD.
  • Custom mode allows players to create games that players manually join rather than relying on the game's matchmaking system to create the teams. In custom matches, the teams can be uneven and may include a mix of players and bots (computer-controlled champions).
  • Classic mode is a normal or ranked match in which a team wins by destroying the enemy team's Nexus, which can only be attacked if all lane turrets and the inhibitor in at least one lane and all base turrets are destroyed. Classic mode is played in two different styles: either 5 vs. 5 on a three-lane map, each team's side having three lane turrets and an inhibitor per lane, as well as two base turrets and a Nexus; or 3 vs. 3 on a two-lane map, each team's side having two lane turrets and an inhibitor per lane, as well as one base turret and a Nexus. The map also has three altars, two of which add bonuses to the players, and one that heals the players. These altars are surrounded by a jungle. There are three types of matches in Classic mode:
    • Normal matches are player versus player. Before the beginning of the match, there are several ways for team players to select their champions. Blind pick matches allow both teams to pick champions at the same time, but each team does not learn what the opposing team has picked until all picks have been finalized; players may therefore incidentally choose the same champion as a player on the opposing team, but players may not choose the same champion as another player on their own team. Draft pick randomly assigns a team captain for each team, who then take turns banning three champions each, disallowing both teams from playing those six champions. Draft players then choose their champions in an ordered back-and-forth format. Because both teams can see which champion each player is picking, no player can pick a champion that has already been picked by another player.
    • Ranked matches are available to players that are level 30. Ranked uses a draft pick system exclusively, and players are seeded into a League system based on the outcome of their matches. Winning and losing games influences a player's MMR, which is intended to keep all players' skill levels in any given game as close as possible.
    • Co-op vs. AI mode matches players against a team of bots. Similar to the Tutorial mode, it is also intended mainly as a way for inexperienced players to learn.
  • Dominion mode is a normal match played 5v5 on Crystal Scar, a map with a single circular lane that has five neutral turrets arranged in a star pattern. A team wins by reducing the life total of the enemy team's Nexus, which only occurs if the opposing team controls at least three of the five neutral turrets, until it is zero.
  • ARAM (All Random All Mid) mode randomly picks champions that the players are able to play, allowing up to 2 re-rolls if the player is unsatisfied with their pick. Players may also trade with teammates if both parties own the champions to be traded. The mode is played 5 vs.5 on Howling Abyss, a one-lane map with each team's side having two lane turrets, an inhibitor, two base turrets, and a Nexus. A team wins by destroying the enemy team's Nexus, which can only be attacked if both lane turrets, the inhibitor, and both base turrets are destroyed.
  • One for All mode was the first limited-time game mode that was available during the 2013 Harrowing, and is no longer available. In this game mode, each team was randomly assigned a caption, who then took turns banning three champions each, disallowing both teams from playing those six champions. Players on each team would then select champions at the same time. Each player was only aware of their own team's choices until all picks are finalized, as with blind pick. However, there was no restriction on choosing a champion that has already been picked. Once all players had chosen, each team was assigned the champion that was picked by the most players on that team, and all players had to play as that champion. In the event of a tie, the game randomly selected the champion. One for All could be played 5 vs. 5 on either the Summoner's Rift or Howling Abyss maps. This game mode later returned at the end of May 2014, with a new twist - both teams were assigned the same champion. This version, called One For All: Mirror Mode took place only on the Howling Abyss (ARAM) map.
  • Showdown was the second limited-time game mode, available during the 2013 Snowdown Showdown. Showdown was played either 1 vs. 1 or 2 vs. 2 on the Howling Abyss map. Each team played until one team achieved one of three goals: taking down an enemy turret, reaching 100 team minion kills, or killing the enemy player (or two in 2 vs. 2 matches).
  • Hexakill mode was the third limited time game mode. Taking place on Summoners Rift, each team had six players instead of the typical five.
  • Ultra Rapid Fire mode was introduced on April 1, 2014 as the fourth limited-time game mode. It is a Classic Draft game, except that all champions had their movement speed increased, gained gold quicker, could use abilities without using mana or energy, and had more powerful ranged attacks, among other changes. Several champions are unavailable in this mode.[12][13]