as when they first start the game, complete a quest, or refer a friend to the game. Many browser games have an "energy bar" that depletes when the player takes actions. These games then sell items such as coffee or snacks to refill the bar. Free-to-play games are free to install and play, but once the player enters the game, the player is able to purchase content such as items, maps, and expanded customization options. Some games, such as id Software's Quake Live, also use in-game advertising to provide income for free-to-play games. In addition to making in-game items available for purchase, EA integrates in-game advertising into its games. In August 2007, EA completed a deal with Massive Incorporated, which lets Massive update and change in-game advertising in real-time within EA games. Independent game developer Edmund McMillen has claimed that he makes most of his money from sponsors by placing advertisements into the introduction of a game and the game's title screen. History Matt Mihaly created the first known business model of exchanging virtual items for money in an online game, in 1997 for the flagship title Achaea, Dreams of Divine Lands for his corporation originally Achaea LLC that later became Iron Realms Entertainment. The free-to-play business model in online games was later realized by Nexon in South Korea to a degree first catching more major media attention at the time. The first Nexon game to use it, QuizQuiz, was released in October 1999. Its creator Lee Seungchan would go on to create MapleStory. The free-to-play model originated in the late 1990s and early 2000s, coming from a series of highly successful MMOs targeted towards children and casual gamers, including Furcadia, Neopets, RuneScape, MapleStory, and text-based dungeons such as Achaea, Dreams of Divine Lands. Known for producing innovative titles, small independent developers also continue to release free-to-play games. Free-to-play games are particularly prevalent in countries such as South Korea and the People's Republic of China. Microtransaction-based free-to-play mobile games and browser games such as Puzzle & Dragons, Kantai Collection and The Idolmaster Cinderella Girls also have large player populations in Japan. In particular, the Nikkei Shimbun reported that Cinderella Girls earns over 1 billion yen in revenue monthly from microtransactions. Electronic Arts first adopted the free-to-play concept in one of its games when it released FIFA Online in Korea. In the late 2000s, many MMOs transitioned to the free-to-play model