Presss ~ to open the console, then enter /svdevmap [map name] to load the level in single player mode. Then enter any of these codes in the console:
Code Effect /iamacheater All levels unlocked at skill 1 /iamamonkey All levels unlocked at skill 100 /give all All weapons and ammo /god God mode /model sarge/krusade Hidden skin /noclip No clip mode /give [item name] Spawn item
Contributed By: Starky27.
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You can submit a problem report for any non-working or fake code in the lists above.