The series consisted of five games, each of which followed directly upon the events of the last. New games frequently referred to previous entries in the series, often in the form of cameos from recurring characters. The objective of the series is to transform the player character from an average adventurer to a Hero by completing non-linear quests.
Each career path had its own strengths and weaknesses, scenarios unique to those that possess the skills associated with it. Each class also had its own distinct way to solve various in-game puzzles, which encouraged replay: some puzzles had up to four different solutions. For instance, if a door is closed, instead of lockpicking or casting an open spell, the fighter can simply knock down the door. The magic user and the thief are both non-confrontational characters, as they lack the close range ability of the fighter, but are better able to attack from a distance, using daggers or spells.
Each character class featured special abilities unique to that class, as well as a shared set of attributes which could be developed by performing tasks and completing quests. In general, for a particular game the maximum value which can be reached for an ability is 100.
General attributes influence all characters classes and how they interact with objects and other people in the game; high values in strength allows to move heavier objects and communication helps with bargaining goods with sellers. These attributes are changed by performing actions related to the skill; climbing a tree eventually increases the skill value in climb, running increases vitality, and so on.