Before you continue my walkthrough guide, I would like to take a few notes on some symbols and specific annotations. As you already know that Final Fantasy III (3D Remake) doesn't have dungeon maps, so that I re-created them using 8-bit 2D style to visualize directions, chest locations, and other important spots/people like MogNet or bosses etc. On top of that, I will also list chest list and monster list in specific area (missable monsters). Below is a few notes you will find it useful:

• A number in parentheses: represents the order of destination you have to go.
• Stairs icon: represents an entrance from one floor/dungeon to another.
• Door icon: represents a door or the first entrance.
• Person icon: represents important an character, it can be a boss, an NPC that you need to talk to.
• Gold coin icon: represents an item that is not a chest, usually it's a hidden item.
• (trap): means that there is a monster inside the chest.
• (Optional): means that the section is not required for the story to progress. But you must do it for perfect game.

Here is a list of areas/dungeons that will not be accessible after certain points in the game listed in order of progression, so make sure that you collect all chests and bestiary list in that specific areas/dungeons:

1. Castle Hein: Once you get inside, you cannot come out until you defeat Hein. After defeated Hein, you will lose access to the castle.
2. Wracked Ship: Can only enter once the first you sail to the Surface World. There is no monsters, however, there are 2 chests you need to collect here.
3. Sea Surfaces: There are 3 sea surfaces, Floating Continent's inner sea, outer sea, and Surface World's sea. You won't be able to sail after losing the. Enterprise. You will lose your Enterprise when you fly over Saronia.
4. Lake Dohr: As long as you don't kill Leviathan, you can get in/out any time.
5. Doga's Grotto: You cannot enter this dungeon after killing Doga and Unei, so be sure to collect everything.