League of legends is a free-to-play multiplayer online battle arena, real-time strategy video game developed and published by Riot Games for Microsoft Windows and OS X. There are lot of people playing this game, because it is free, it doe not need a lot of money to play, without money, we can still enjoy the game. Second, it is constant updates, this game will change a system every month. So there will always have something new in this game, and players will be attracted by this game, they will not feel boring. Finally, it is competitive, in this game, there are two teams to compete with each other, and every team wants to win, so if people wants to win, this game is very good.