Press the M, S and V keys all at the same time on the main menu to get the cheat box then put in one of the following codes

notgod God mode off
god God mode on
console Makes ~ bring up the console
flashlight Flashlight Mode
gimme maps Go to custom game menu for all campaign missions
the new generation of rts-games Get Secret Sabotage mission in the Custom game menu
from massive with love weird textures