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Duke Nukem 3D Hints
Where is the blue card?
1 of 5: The blue card will open the back door to the hotel, which is close to where you start.
2 of 5: Jump around and look everywhere.
3 of 5: Especially up.
4 of 5: The blue cards on a ledge on one of the buildings.
5 of 5: Hop around on boxes and ledges until you get to the card.