WARNING: Use at your own risk. I can't possibly test every combination of events with this code and I don't have time to do a full play-through to test how the story will cooperate with it. Initially it looks good, if you don't try to do anything story or dialogue related too early.
Request: If you succeed in doing anything unusual with this code or you find major failures in it that can't be overcome, please let me know. I frequent the CMGSCCC.com message boards and I can also be found on gamefaqs. Or you can e-mail me by attaching "webmaster" and @ to the root URL of this site (piedpiperplayers.com).
Suikoden III Roaming Plan
41973064 003D0001
82828282 00000000
41973188 002A0001
02020202 00000000
This code allows travel and access to all areas at any time. I can't guarantee that trying to do certain story events early won't ruin the game, for instance if you were to take out the Twin Snake on Mountain Pass with someone other than Geddoe. It may crash rather than allow the fight to happen, or it may let it happen and crash afterwards, or it may not crash until Geddoe has only a golem to fight, or it may not crash at all. I can't say.
If you go into a town early, you may not be able to talk to anybody with certain characters. If there were a single dialogue tree, it would be okay, but since there are many the game hoses up when it tries to load dialogue.
Fighting works fine. Every area I accessed that had random encounters worked fine and you can get very good experience early on. I did not try the treasure bosses however.
This code also opens up several otherwise invisible options on the towns list. Among them are Test (which shows up blank), In Crystal Valley, Geddoe: Prologue, and The Ruins of Cyndar. I haven't been able to access any of these as yet, but I've only tried it with Chris.
I recommend using the following codes along with it.
Add the Blinking Mirror into Event Item Slot 1
Early-game version.
21972D00 0000025E
D196B3F2 00000001
21972D04 00000001
D196B3F2 00000002
21972D04 00000002
D196B3F2 00000003
21972D04 00000003
D196B3F2 0000001D
21972D04 00000004
D196B3F2 000000CB
21972D04 00000002
Recruit Teleportress Viki
1196B61E 00000404
Using these two codes and the roaming code will allow you to return to the castle and teleport to anywhere from the moment a character has access to the world map.