A number of changes have been made to the base (vanilla) game to accommodate the open world randomizer. The vanilla game had no intent for visiting areas in abstract order, and certainly did not intend for visiting different worlds. First review the key items page to make sure you understand each key item and what it unlocks. This page will not always explain exactly why a change is made, but in general, the changes are made to accommodate either logical chains for player progression, or to prevent bugs. In particular, erratic game behavior arises when players transition between worlds when not using the WarpShard.

Overall

• The player can use the WarpShard in many locations, but some locations disallow warping. Disallowed warp areas include those during special sequence areas (like Fork Tower, Zeza Fleet and Kuzar Castle upstairs) and some other exceptions.
• Some areas can be accessed from multiple worlds. For example, North Mountain can be accessed in Worlds 1 and 3. In World 1, the Magisa & Forza fight is present, and in world 3, both the Magisa & Forza and Bahamut fights are present. The game has overall been changed to allow for access bosses from any world
• In seeds where the player is locked initially to World 1, the Adamantite Key Item allows for access to World 2
• In seeds where the player is locked to World 2, defeating Exdeath in World 2 will unlock World 3, which is accessible via the key items Anti-Barrier (to enter Exdeath's Castle) and the Bracelet (to transform Exdeath's Castle)

World 1

• The entrance to Torna Canal can be entered and re-entered to transport the player to the Ship Graveyard. The Ship Graveyard is a one-way exit to the world map, and the back entrance to the Ship Graveyard can not be entered from the world map.
• Access to the Catapult (Cid/Mid's secret underwater base) is granted via the Ruined City, which can be reentered until defeating Crayclaw. Upon defeating CrayClaw, Ruined City access changes to the Lonka Meteor, and access to the Catapult is granted via the submerge access outside Crescent Town. Earth Crystal no longer influences world map change. This was done to clean up the world map graphical weirdness with the Ruined City meteor & town. The player will never be locked out of the Catapult area (access to Steamship) because Crayclaw also unlocks the base entrance
• The Steamship is accessible via the Catapult, either from Ruined City access or from outside Crescent Town. The Steamship is NOT outside of Karnak, which is due to a limitation of the game engine. Entering the Steamship and completing its events will transport the player to Karnak Castle, and the Karnak Escape sequence will begin.

World 2

• The Cave of Jacohl exit into Bal Castle (Odin location) is now only a one-way exit. Meaning, the player can no longer go down the cave from Bal Castle. The door to Odin is always unlocked, from both World 2 and 3. The player can still access the Odin basement from Cave of Jachol in World 3 at any time