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Duke Nukem 3D Hints
Where is the blue card?
1 of 4: The blue card will open the door right near the beginning.
2 of 4: Take a small swim and search for it.
3 of 4: In the water area here, swim around and you'll find an opening at the end of the tunnel.
4 of 4: Swim to the surface, and get the blue card. Take note of the red card door here.
