At the ‘Option’ menu enable the console and press ‘~’ (tilde) to display the console window. Type ’seta thereisacow 1337′ as a console command and press ‘~’ to display the console window again. Then type the following codes to enable the corresponding effect in the game.
God Mode:
Type god
God Mode (screen shakes):
Type demigod
Flight Mode:
Type ufo
All weapons:
Type [...]