Crysis Cheat Code

Head to the difficulty files in your Crysis folder (for example: C:\Program Files\Electronic Arts\Crytek\Crysis\Game\Config). The four files you're looking for are titled diff_easy.cfg, diff_normal.cfg, diff_hard.cfg and diff_bauer.cfg. Open the file (using Notepad) of the difficulty level you are currently playing or wish to edit. Add the following line to the end of the file and save it:
Code
---------------------------------------------
God Mode - g_godMode = 1
No Target - ai_IgnorePlayer = 1
No Weapon Limit - i_noweaponlimit = 1
Unlimited Ammo - i_unlimitedammo = 1
No energy loss - g_suitCloakEnergyDrainAdjuster = 0
No energy cost - g_suitRecoilEnergyCost = 0
Run faster - g_suitSpeedMult = 2.85
More armor points - g_suitArmorHealthValue = 900.0
Instant health regen - g_playerSuitArmorModeHealthRegenTime = 0
Instant health regen while moving - g_playerSuitArmorModeHealthRegenTimeMoving = 0
Set health regen time to 0 - g_playerSuitHealthRegenTime = 0
Set regen time while walking to 0 - g_playerSuitHealthRegenTimeMoving = 0
No waiting until regen starts - g_playerSuitHealthRegenDelay = 0
Instant energy - g_playerSuitEnergyRechargeTimeArmor = 0
Instant energy while moving - g_playerSuitEnergyRechargeTimeArmorMoving = 0
Set energy regen time to 0 - g_playerSuitEnergyRechargeTime = 0
Do not wait until energy regen starts - g_playerSuitEnergyRechargeDelay = 0
Extra health - g_playerHealthValue = 900.0
Set difficulty, "1" is easy - g_difficultyLevel = 1
Speed suit never runs out of energy - g_suitSpeedEnergyConsumption = 1
Toggle melee attacks while sprinting - g_meleeWhileSprinting = <0>
Set swim speed; "4" is default - pl_swimBaseSpeed =
Walking movement speed; "1" is default - g_walkmultiplier =
Toggle vehicle invincibility - v_goliathmode = <0>

You can also modify your suit stats. For example:
g_playerHealthValue = 400.0
g_playerSuitArmorModeHealthRegenTime = 0
g_playerSuitArmorModeHealthRegenTimeMoving = 0
g_playerSuitEnergyRechargeDelay = 0
g_playerSuitEnergyRechargeTimeArmor = 0
g_playerSuitEnergyRechargeTimeArmorMoving = 0
g_playerSuitEnergyRechargeTime = 0
g_playerSuitHealthRegenDelay = 0
g_playerSuitHealthRegenTime = 0
g_playerSuitHealthRegenTimeMoving = 0
g_suitArmorHealthValue = 400.0
g_suitCloakEnergyDrainAdjuster = 0
g_suitRecoilEnergyCost = 0
g_suitSpeedEnergyConsumption = 0
g_suitSpeedMult = 2

After making all of your edits, save the file, load up a new game
and see what you've edited!