Detailed documentation on how Final Fantasy IV works.

For the most part, these articles will apply to Vanilla FF4 as well as Free Enterprise.

For a general guide to the battle system, see simbu's Battle Mechanics guide.

• Relative Agility: How characters' and monsters' speed is determined in battle.
• Speed Modifier: How spells like Slow and Fast affect things.
• Battle Timers: How the game determines what order events occur in battle.
• ATB System: The battle system in its entirety.

• Status Priority: Used in determining whether certain magical or physical attacks will inflict a status effect.
• Status Procs: Used to determine whether a physical attack can successfully inflict a status effect.