On this page, we're going to detail the most natural World Order in KH3 for progression - as in what order matches up to character levels most correctly.
Certain worlds also contain certain materials for workship synthesis and KH3's new cooking mechanic, while others have side quests with powerful rewards, like the Golden Hercules Statue side quest on Olympus. It impacts the order you acquire some keyblades, as many weapons are rewarded for completing worlds as detailed in our keyblades list and guide. World order will also determine some other things. In Kingdom Hearts 3, worlds are gradually unlocked a few at a time, though every time you reach a major milestone in the game's story you'll always have a choice between a couple of different worlds to fly your Gummi Ship to in order to meet or revisit friendly faces from the lands of Disney. This is much the same as the beginning 'what do you desire' choices between buffs like Wisdom, Vitality and Balance - it doesn't have an enormous impact on the game, but is a fun choice to make nevertheless.
Kingdom Hearts is a deeply story-driven RPG series, but one aspect of these games has been set in stone since the PS2 original: a bit of player agency in terms of where to go and when.