Street Fighter II: The World Warrior,[a] also known simply as Street Fighter II, is a competitive fighting game developed by Capcom and originally released for arcade systems in 1991. It is the second installment in the Street Fighter series and the sequel to Street Fighter, released in 1987. It is Capcom's fourteenth title to use the CP System arcade system board. Street Fighter II improved many of the concepts introduced in the first game, including the use of special command-based moves and a six-button configuration, while offering players a wider selection of playable characters, each with their own fighting style, and introducing the combo system. Street Fighter II became the best-selling title since the golden age of arcade gaming. By 1994, the game had been played by over 25 million people in the United States alone at home and in arcades. Due to its success, a series of updated versions offering additional features and characters were released. All versions of Street Fighter II have sold more than 200,000 arcade cabinets and over 15 million software units worldwide, and they are estimated to have grossed over $10 billion in total revenue, making it one of the top three highest-grossing video games of all time as of 2017 and the best-selling fighting game up until 2019. The SNES version of Street Fighter II sold over 6.3 million cartridges, making it Capcom's best-selling single software title for the next two decades and their best-selling game on a single platform. Street Fighter II is regarded as one of the greatest video games of all time, and in particular the most important and influential fighting game ever made. Its launch is seen as a revolutionary moment within its genre, credited with popularizing the fighting genre during the 1990s and inspiring other producers to create their own fighting series. It also sparked a renaissance for the arcade video game industry, and had an impact on competitive video gaming and wider popular culture such as films and music.