The game developed by Ons On Soft and published by Outspark for all other countries except Korea, is a free-to-play MMORPG with anime style graphics.

The five classes available in Fiesta are based on general archetypes and the naming convention is pretty straight forward: Fighters, Archers, Mages, Clerics and Tricksters. Each class has three ranks which open up certain specialization paths. Choosing a specialization (they are also called promotions) is mandatory for character advancement.

Player vs. Player (PVP) is limited in Fiesta to specially designed areas which can have level restrictions. As long as the players that join the PVP areas are no grouped, the general rule of such encounters is free-for-all.

Other significant features included in Fiesta Online are the In-Game Weddings and the Estate System. The first allows players to propose to other players and if the proposal is accepted to participate to the wedding which is held in a special chapel that can accommodate up to thirty guests. After the ceremony is over the “newlyweds” receive special in-game bonuses. The Estate System allows players to own and decorate their own private estate. Each of these houses can hold up to fifteen guests.

The Fiesta Online client can be downloaded from game's official site at no cost.