Hi,

In the second map, I cleaned up a good part of the level, I visited the sewers but I only have the yellow keycard.

So I don't know where to go, would you have a clue, please?

I don't want a video solution that ruins the fun.

Thank you in advance.

Edit.

Thank you very much for your help.

I think I made a mistake: reading your post I thought you wanted an hint for the second map that is "Where It All Began", but now I've read the thread title and I see you need help for "Deja Vu" that is the first level.

Well, if you are stuck in the first level, I suggest you to visit the forbidden videos and book store and explore the bathroom thoroughly... or maybe make a good use of your jetpack.
Feel free to ask for other hints, if needed: I have not spoiled too much information deliberately.

Thanks for the advice, it was the Jetpack in the sewers that I forgot to pick up, after that it was easy.

So I reached the third map still in 'Nuclear Winter'.

Thank you for your proposal, it's very nice of you, I'll take note of it. :)

As I'm really into addons right now (except Duke Caribbean: Life's a Beach) I guess you've all finished, because I'd be tempted to ask you for more advice if I ever get stuck in one of them. ;)