There are two other official versions: Knight Online Ross (usually called "JPKO") is hosted in Japan, while Knight Online World is hosted in the United States. Some people refer to Knight Online World as USKO. Both of these versions accept registration from any location. The Knight Online World version is popular in Turkey, and knight gold players from this country are an overwhelming majority in that version, which means it's hard to find a player speaking another language. Knight Online is officially free-to-play (although to connect to the utmost of the servers during prime time, paid premium is required), but there are some features that must be paid for. In addition, there is an in-game Power up Shop or Store which contains various items that one can purchase such as premium packages. Paid services include exclusive items and Premiums which are a limited-time subscription providing many benefits.