[maltz]

After going through the game once I recommend this:

(1)
Greenwort - 5
Verlon Forest - 15
Marshan Swamps - 25
Arlania - 15

You can leave some quest unfinished as you will return here several times in the future.

(2)
Western Islands - 25
Eastern Islands - 25

Return to (1) to buy Holy Indulgence (swamp) and back to (2) to finish everything.

(3) Upper Hadar - 35
Lower Hadar - 35
Ardan Peaks - 45
Taron Mines - 45 - Underground Sea.
Mehgard - 45

You can leave some quests unfinished as you will return here in the future. Go the underground sea from Taron Mines to access some spells/flags. If you want you can sneak into Demonis to buy troops/pick up valuables.

If you care about scores, it is "faster" (in terms of in-game days) to walk from Darion to the Dwarf lands.

(4)
Magic Valley - 55
Great Wood - 65
Valley of Thousand Rivers - 55

Clear as much surface as you can before advancing to the undead land below - enemies are much tougher there.

Grey Heathland - 75
Death valley - 85

You don't need to finish all quests here yet, as you will return in the future (just before the last area).


(5)
Dwarf land - Underground Sea - Demonis - 95

Finish everything here. Don't forget about the Pyramid - hopefully you didn't miss any obelisk!

(6)
Elf land - Haas's labyrinth - Murok

Straight to the end!