Monster Hunter Frontier Online (モンスターハンター フロンティア オンライン, Monsutāhantā Furontia Onrain), later renamed as Monster Hunter Frontier Z, was a massively multiplayer online role-playing game (MMORPG) for Microsoft Windows, the first spin-off in the Monster Hunter franchise to appear on the platform. Monster Hunter Frontier was released on the Xbox 360 in Japan on June 24, 2010, where it sold 93,000 copies during its initial launch week. It was continually updated through expansion packs known as Seasons and Forwards, which introduced new locations, armor sets, and new monsters. All Monster Hunter Frontier online services ended on December 18, 2019.