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Duke Nukem 3D Hints
Where is the blue key card?
1 of 5: The blue key card will open a door that's underwater, not far from that big, neon lounge sign.
2 of 5: Not far from there, you can find an opening in the rock.
3 of 5: Swim up through that opening, and jump around on the rocks.
4 of 5: You'll find the blue card up there.
5 of 5: Note that door you'll find not far from here that you need the red card for.
