Seal Online is a massively multiplayer online role-playing game. It is set in the medieval fantasy world Schiltz and shares much of its geography and lore with Seal: Travelers of Destiny. Many of the organizations and characters from that game return; however, the overall tone of the setting has been made lighter and more cheerful.
In the original release there were seven classes to choose from: Warrior, Knight, Craftsman, Mage, Jester, Priest and Beginner. The latter allows the player to switch to any other class after level 10. Other classes were added in subsequent updates.
Quests are offered in towns and their guilds. Players can opt to form parties in order to complete quests together. It is also possible to trade, open band accounts, acquire and nurture pets, and fish.
Combat relies on a combo system: powerful combos can be executed by pressing correspondent keys when a special bar is halfway filled. Skill points are awarded after leveling up; players can choose to distribute them to improve the characters’ attributes.