Cheats for Crysis Warhead (PC)

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:
g_godMode = 1                                  - God Mode                              
ai_IgnorePlayer = 1                            - No Target                             
i_noweaponlimit = 1                            - No Weapon Limit                       
i_unlimitedammo = 1                            - Unlimited Ammo                        
g_suitCloakEnergyDrainAdjuster = 0             - No energy loss                        
g_suitRecoilEnergyCost = 0                     - No energy cost
g_suitSpeedMult = 2.85                         - Run faster
g_suitArmorHealthValue = 900.0                 - More armor points
g_playerSuitArmorModeHealthRegenTime = 0       - Instant health regen
g_playerSuitArmorModeHealthRegenTimeMoving = 0 - Instant health reg. when movin
g_playerSuitHealthRegenTime = 0                - Set health regen time to 0
g_playerSuitHealthRegenDelay = 0               - No waiting until regen starts
g_playerSuitEnergyRechargeTimeArmor = 0        - Instant energy
g_playerSuitEnergyRechargeTimeArmorMoving = 0  - Instant energy while moving
g_playerSuitEnergyRechargeTime = 0             - Set energy regen time to 0
g_playerSuitEnergyRechargeDelay = 0      - Dont wait until energy regen starts
g_playerSuitHealthRegenTimeMoving = 0    - Set regen time while walking to 0
g_playerHealthValue = 900.0              - Extra health
g_difficultyLevel = 1                    - Set difficulty, "1" is easy
g_suitSpeedEnergyConsumption = 1         - Unlimited energy for Speed suit 
g_meleeWhileSprinting = <0 or 1>         - togglw melee attacks when sprinting
pl_swimBaseSpeed =                       - Set swim speed; "4" is default
g_walkmultiplier =                       - Walking movement speed; 
                                            "1" is default
v_goliathmode = <0 or 1>                 - Toggle vehicle invincibility          
cl_strengthscale =                       - Multiplies punch strengt;
                                            "1"is default
ai_UseAlternativeReadability = 0         - Koreans speak in Korean               
r_displayinfo = <0 or 1>                 - Toggle frame rate display
i_giveitem                               - Spawn indicated item

Cloaked Frog:
The invisible (or cloaked) frog can be found in the 'Below the Thunder'
level, just after you get off from the big yellow elevator that takes 
you up. To find it, as soon as you get off from the yellow elevator you
will come to a room. Look at the roof and you will see a metal grate. 
Shoot that and jump up into the hole. Once in the vents, keep taking 
lefts till you get to a dead end... he will be sat on a red book 
'Croaking while Cloaking'.
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