First, hit ''enter'' on the Num pad. Then type in any of the following cheats:
Shadow -> Invisible
TeamShadow -> TeamInvisible
Sumerman -> God
TeamSumerman -> Team God
Ammo -> unlimited Ammo
Refill -> Refill Ammo
God -> Get struck down
We have more cheats and tips for this game here, The Sum of All Fears cheats
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