There is a place with 6 doors in a semi-circle, plus 4 levers
and a coin slot.
More-or-less by trial and error I have 4 open, but can't get
the last two. Is there some way to logically work out what to
do? If so, please tell me and I will keep trying (a hint maybe
would be helpful); if not, please post the answer. I getting
low on coins and reloading games takes soooooo long!

Being a Dwarf I made pertinent notes concerning this situation and damn me if I haven't left them elsewhere,if you can tell me wich doors are still shut(counting from the left) and what positions the levers are in(also from the left)then I can help you.I think someone actually left a complete conclusion to this puzzle in the "spoilers and hints" section of the Ironworks W&W site but haven't checked it to see if I agree with them.They theorised that I could be random.Take a look and if it doesn'thelp you then ask me.

Here is the combination for all the doors:
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Okay facing the doors:
n n n f
n n f n
n f n n
f f n f
f n n f
f f n n

f= off
n= on

Hope this helps.

Mark