Darklight Conflict cheats and cheat codes for PC

Indestructible mode:
During gameplay, hold down TAB and hit the page-up key in the same time. 
Then let go and press the letter P. 
You will see a "cheat enabed" message at the bottom of the screen.
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 combat situations. 

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.