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Duke Nukem 3D Hints
Where are some secret locations?
1 of 5: (1) In the first dark room, look in the compartments at various spots in the room.
2 of 5: There's a hidden passage behind one of them.
3 of 5: One of them leads to place that has 1138 on the monitor, a reference to one of George Lucas' projects.
4 of 5: (2) In the second dark room (behind the lift, past the force field) there's a hidden door in the northeast corner.
5 of 5: (3) Finally, inside the Incubator, looks for a whole bunch of niches underwater.