Duke Nukem 1
Cheat Codes:
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Press [BACKSPACE]+[PAGEDOWN] for full weapon power and all keys.
Full heath and level skip:
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Run Duke Nukem using asp(without the quotes) in the command line.
Then you can use the following Cheats:
[G]+[O]+[D] = Full health & items.
[G]+[O]+[W] = Skip levels.