Duke Nukem 2

Cheat Codes:
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Unregistered version:

Press [G]+[O]+[D] while playing.

Registered version:

[E]+[A]+[T] : Full energy, zero score
[N]+[U]+[K] : Random weapon, items

Random weapons and items for current level:
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Press N + U + K. Alternatively, press D + U + K + M. 

Display message:
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Press G + O + D. 

Secret bonus:
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Complete the indicated tasks to unlock a secret bonus.

-Destroy all cameras in the level. 
-Complete the level without losing energy. 
-Find all weapons. 
-Pick up all items. 
-Destroy all cannons in the level. 
-Destroy all bombs in the level. 
-Destroy all crystal balls in the level without touching them. 

Bonus points:
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If you collect the letters "N", "U", "K", "E", and "M" in the correct 
order, you will get 100,000 points. If you collect all those letters, 
but out of order, you will only get 10,000 points.