The VG Resource

https://www.spriters-resource.com/snes/terranigma/

I'm using the European version.

Towns / Villages - Exterior
Loire (Expansion 0)
Loire (Expansion 1)
Loire (Expansion 2)
Nirlake (Expansion 0)
Nirlake (Expansion 1)
Nirlake (Expansion 2)
Freedom (Expansion 0)
Freedom (Expansion 1)
Freedom (Expansion 2)
Litz (Expansion 0)
Litz (Expansion 1)
Suncoast (Expansion 0)
Suncoast (Expansion 1)
Suncoast (Expansion 1 - Zoo)
Yunkou
Neotokio
Liotto
Liotto (Night)
Penginea
Lhasa
Crysta
Storkolm
Louran
Louran (Ruins)
Mosque

Towns / Villages (Interior)
Loire (Expansion 0)
Loire (Expansion 1)
Loire (Expansion 2)
Nirlake (Expansion 0)
Nirlake (Expansion 2)
Freedom (Expansion 0)
Freedom (Expansion 1)
Freedom (Expansion 2)
Litz (Expansion 0)
Litz (Expansion 1)
Suncoast (Expansion 0)
Suncoast (Expansion 1)
Yunkou
Neotokio
Liotto
Penginea
Lhasa
Crysta
Storkolm
Louran
Louran (Ruins)
Mosque

Other NPC Areas
Alaska Regions (Tent, Ruins, Stopover)
Caravan
Quatro's
Rich's
Poultry Races
Poultry
Molly's
Tollgate
Nomads'
Polynese
Australia Regions (Airsrock, Mountain Wall & River)
Asia Regions (Islands)
Kingnest
Sanctuar
Nirlake Exp. 0 & 1 / North America (Will's House)
Suncoast Exp. 1 / Australia (Ranch)
North America (Farm)
Loire Castle (Minigame)
Loire Castle BF, 1F, 2F, 3F
Harbor of Freedom
Harbor of Litz
Harbor of Liotto
The Box
Ship
Mu
New Zealand
Colorado River
Europe (Mountain)
Evergreen (Expansion 0)
Evergreen (Expansion 1)
Evergreen (Expansion 2)

Enemy Maps
Gumin Forest
Sylvain Castle (Battlements)
Sylvain Caslte (Courtyard)
Sylvain Castle (Dining, Kitchen, Guard, Storage, Hallway)
Sylvain Castle (Throne Room, Anteroom)
Sylvain Castle (Chapel)
Sylvain Castle (Bloody Mary's Battleground)
Sylvain Castle (Royal Chambers)
Eklemata 2
Norfest 1, 6, 13, 14, 17

References:
https://vgmaps.de/maps/snes/terranigma.php
Tool:
bsnes-rawpalettes: https://www.vg-resource.com/thread-43257.html
Codes:
Walk through Walls
7E100411 for ON,
7E100415 for OFF
this code has too many bugs, it's nearly impossible to go through a door and sometimes you're stuck in the wall after using one
99 Strenght
7E0662:63
99 Defense
7E065F:63
Walk through Walls
3C29-1FAD
6226-170D

Code Sources:
https://tcrf.net/Terranigma
https://gamehacking.org/game/45135
Savefiles:
https://www.zophar.net/savestates/snes/terranigma.html (only tried the first one, which works)
https://fantasyanime.com/legacy/terran_saves.htm (saves all work)

Surprisingly easy to rip, some maps don't even have layers.

This one misses the space without the Quintet building.
Maybe I'll post more WIPs when the areas get bigger and more complicated to rip.

Almost all town exteriors are now done, except the ones which only have a limited time in the game, like intact Louran, nightly Liotto and burnt Nirlake.
Now going for the small npc areas.

Since a lot of people seem to have problems with burning down Nirlake for the town expansion:
https://www.terranigma.be/index.php/Town_Expansions

Personally, I knew that you need to invent the hamburger (meat + bun) and after a certain point the town will burn down, according to my old game guide.
What this guide didn't mention: You also need to talk to Bell after the invention of the telephone.

From other threads in forums and reddit, people only suggested two of the three conditions, which left everybody in confusion why Nirlake won't burn down.

Anyway, just ripped the map and now every major (expandable) town is ripped. At least with its exterior, that is.

Now going for the interiors.

Litz 0, Suncoast 0 & Nirlake 0 have been finished, didn't start Loire 0 & Nirlake 2 (Nirlake 1 doesn't have an interior).
Not sure if I do Stockholm, since it's just a recolour of Crysta. Same for Neotokio after Beruga's attack.

I left a lot of space on the WIPs since I need it to assemble the maps.

Saving Freedom, Loire & Neotokio for last, they're by far the biggest towns in the game.

I will probably leave out Stockholm, since I have enough on my hands. I want to do Loire Castle, which is also very large and maybe even bigger than the biggest town.

Making good progress, since nearly all town interiors got ripped by now.

I also noticed that every tileset uses its own background colour, therefore I have to check the following maps:
Litz 0
Loire 0
Freedom 0
Nirlake 0
These sheets have different maps with different tilesets, but I thought that every town only has one bg colour for all of its interior maps.

Suncoast 1 is also missing the background colour for at least 2 maps, needs a revision too.

Turns out only Freedom 0 was affected with 3 maps having the wrong bg colour.
Suncoast 1 was missing the background colour for 2 maps.

Both fixed & revised.

The major towns are all done, now I'm working on Lhasa:

Maybe I'll add the light sfx since it's very map specific.

The rest of the castle. They're the kind of maps where the layers mix just like in Rudra.
This just means that you can't put them right on each other without fiddling with the layers.

All major npc areas have been finished.
The Louran Ruins are actually a dungeon, but I want to do them as well.

And yeah, not doing Stockholm. It's just a darker copy of Crysta and I did that already.
It's also a pain to get through Norfest to reach it.

After that, I'm probably done and will call it a day.

Most of it, I'm missing a few rooms.

Everything I wanted to do has been done. I even ripped Storkolm to have all towns on the site.
There are a few smaller maps still on my list, but I think I'll leave them for next time.

At one point you just have to call it, therefore this Project is finished.
But I'm pretty sure I will revisit this game at one point.