Crysis Cheats :

Crank Up Future Style !!!
Bust up those Alien heads !!!!
Seriously...who wouldn't want that suit ??
You will have to Suit Up !!!!!

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:

Result                                   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 or 1>
Set swim speed; "4" is default         - pl_swimBaseSpeed = <number>
Walking movement speed; "1" is default - g_walkmultiplier = <number>
Toggle vehicle invincibility           - v_goliathmode = <0 or 1>
Multiplies punch strengt;"1"is default - cl_strengthscale = <number>
Koreans speak in Korean                - ai_UseAlternativeReadability = 0
Toggle frame rate display              - r_displayinfo = <0 or 1>
Spawn indicated item                   - i_giveitem <item name>


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

~The CompetentStudent