I remember there was an extra dungeons pack released several months after, that plays like rougelike games. Does the gog version include this mode ?

The game is patched to version 1.2 so that means that the pack is released with it. :) I think it's called Nox Quest?

You can download it from [url=ftp://ftp.westwood.com/pub/nox/updates/NoxQEng12.exe]here[/url] . But still... it´s included in GOG release or not?

Yes it is.

Thank for your answer :)

What did the quest pack include?

Like Iceman I'd like to know what it is? Is it the co-op mode mentioned?

If so, does that co-op mode consist of a new (mini?) "campaign"? Or is it a co-op mode for the normal "campaign"?

If there is a 'Solo Quest' button in the main menu then it should be included.
Click here for Nox Quest screenshots.

I bought the game last weekend and played with 6 friends. It's a co-op 'campaign' mode with no story and only a shop keeper at the beginning of each level to fix/upgrade your equipment - kill the baddies and find the exit. Rinse and repeat. There's no friendly fire, but the objective seems to be to compete for score (find more secrets, kill more enemies)

If you mean the solo quest dungeons, yes, they seem to be there. I have used them often to practice in between sessions in the story mode.