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Duke Nukem 3D Hints
Where is the red key card?
1 of 7: The red card will open the big door not far from where you found the blue card (on top of the lounge building).
2 of 7: This card is hidden behind the neon lounge sign.
3 of 7: You'll need to find a way to get it open, though.
4 of 7: There's a switch inside of the building across from the sign that will open it up.
5 of 7: To get it, find the office underwater, and go through it (requires the yellow card).