Jobs are presented as interchangeable classes: in the Famicom version of the game, all four characters begin as 'Onion Knights', with a variety of additional jobs becoming available as the game progresses. Whereas in the original game the player chooses each character's class alignment at the start of the game and is then locked into that class for the duration of the game, Final Fantasy III introduces the 'job system' for which the series would later become famous.
The character class system featured in the first game also reappears, with some modifications.
The experience point system featured in Final Fantasy makes a return following its absence from Final Fantasy II.
