Flyff (short for Fly for Fun) is a fantasy MMORPG by  Korean development company Gala Lab (formerly Aeonsoft & nFlavor).  Flyff is a fairly typical party-oriented grinding game where no character can do everything; efficient play requires working in groups to level up by killing monsters, or Masquerpets. Its main distinctiveness lies in its flying system: flying is the normal method of transportation for characters above level 20. Players control an avatar that spends most of its active time fighting and most of its inactive time running a shop. Character classes are chosen at level 15 and sub-classes at levels 60 and 130, referred to as the first, second, and third job changes. The job changes are obligatory—when a character reaches the requisite level, experience gain stops until the completion of one of the job quests. At level 120, the character can become a Master, returning to level 60 with enhanced powers and able to work its way back up to level 121 and become a Hero. As of version 17, Heroes may select a third job class at level 130 and level up to the current cap of 150. Levels are gained based on experience, which can be acquired by killing Masquerpets and by performing quests. Quests generally involve killing specific Masquerpets and collecting the different quest objects they drop; a typical early quest is that of "Party of Is," with the requirement of collecting 7 Chupims through killing Pukepukes. Flyff features melee, ranged and magic combat, with different skills available to different classes. Health points, fight points, and magic power bars are able to be replenished through food, vital drinks and mana refreshers; some classes depend on assists to heal them with magic. Player versus player (PvP) combat is allowed on all servers without penalty in the form of  dueling. Both players must be over level 15, and within 30 levels of each other, then they must confirm the duel first unless they are within the PvP Arena, a  free-for-all environment found on all servers.  Player killing is allowed only on the Yetti server and carries a high penalty.