I have the books that came with NWN, SOU, and HOtU still. I don't know where the box is with all my software, though, and I don't want to wait until I find it to start playing again (moving sucks....).

The original book, and HotU both have CD keys printed, but not SOU. Is one or the other of those keys usable if I purchase the game here?

Thanks.

I have tested it and it works.
Although I did not attempt to mix and match

Ok, thanks. I'll try it out and report back with the results.

Worst that happens I guess is that I'll have to request a key from GOG.

Cheers.

I did use my CD keys, and it works fine. I have two, but I just used the key from HotU and it works perfectly.