Darklight Conflict

Cheat Codes:
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During gameplay, hold down TAB and hit the page-up key 
simultaneously. Then let go and press the letter P. 
At the bottom of the screen it will say "cheat enabled." 
This will make you indestructible. This won't help on 
missions where you have to keep other things, like the 
War Drum, from blowing up, but it will help in those 
nightmarish combat situations.

Cameron Lewis, Editor
ZENtropy! Electronics Reviews
http://www.zentertainment.com/zentropy

Or you may try this alternate cheat:

HexEdit dl.cfg
goto offset 00000358
change that byte to 32 hexdecimal
save & exit.
You can now choose any mission you want.