To enter these codes you must begin the game with the command-line shortcut of '-DEVMODE' (example: 'C:Program FilesCrysisbin32Crysis.exe' -DEVMODE) to activate the following keys so they enable the effect you want in the game.
Using a text editor program go to the 'crysisgameconfig' directory abd find the 'diff_easy.cfg', 'diff_normal.cfg', 'diff_hard.cfg' or 'diff_bauer.cfg' files and edit them to change game play on the Easy, Normal, Hard or Bauer difficulty setting. This is done by inserting the following lines (without the quotes) at the end of the file and saving it. It is advised that before you begin this procedure that you create a backup file of any files you want to edit.
Unlock God Mode: Type the line 'g_godMode = 1'. When this password has been enabled your health armour will automatically replenish when it reaches '0' and you will not die.
Unlimited Ammo: Type the line 'i_unlimitedammo = 1'.
Enemies Ignore You: Type the line 'ai_IgnorePlayer = 1'.
Carry Unlimited Number of Weapons: Type the line 'i_noweaponlimit = 1'.
These lines can also be edited to enable the desired effect in the game.
No Energy Loss: Type the line 'g_suitCloakEnergyDrainAdjuster = 0'.
No Energy Cost: Type the line 'g_suitRecoilEnergyCost = 0'.
Run Faster: Type the line 'g_suitSpeedMult = 2.85'.
More Armour Points: Type the line 'g_suitArmorHealthValue = 900.0'.
Set Health Regen Time to 0: Type the line 'g_playerSuitHealthRegenTime = 0'.
Instant Health Regen: Type the line 'g_playerSuitArmorModeHealthRegenTime = 0'.
Instant Health Regen when Moving: Type the line 'g_playerSuitArmorModeHealthRegenTimeMoving = 0'.
Instant Energy when Moving: Type the line 'g_playerSuitEnergyRechargeTimeArmorMoving = 0'.
Set Regen Time when Walking to 0: Type the line 'g_playerSuitHealthRegenTimeMoving = 0'.
Do Not Wait Until Energy Regen Starts: Type the line 'g_playerSuitEnergyRechargeDelay = 0'.
Set Energy Regen Time to 0: Type the line 'g_playerSuitEnergyRechargeTime = 0'.
No Waiting until Regen Starts: Type the line 'g_playerSuitHealthRegenDelay = 0'.
Instant Energy: Type the line 'g_playerSuitEnergyRechargeTimeArmor = 0'.
Extra Health: Type the line 'g_playerHealthValue = 900.0'.
Set Difficulty (1-4, 4 is most difficult): Type the line 'g_difficultyLevel = 1'.