Defeating Alien Troopers
Use the following trick to kill Alien Troopers without shooting. When the Alien Troopers jump in the air and levitate shortly doing nothing, they are about to charge at you, which may kill you in one hit. When they do this, get out of the way. When they charge and miss, there will be a moment where they are idle. Run up to them, grab, and throw them. This may be slightly difficult at certain angles. The moment you throw them they will die (under the Easy difficulty setting at least).
Killing KPA soldiers
When you attack while in Cloak mode, you instantly lose all your energy. Instead, go to Armor mode (not Strength mode as this takes up energy when you attack), quickly shoot a soldier in the head, then go back to Cloak mode. They will not see you and you will still have all your energy (and even may gain 1 to 3 %). While you are transitioning to Armor mode, you will have a few seconds where you are still invisible to the enemy, which allows you to adjust if you are sniping. Even if you reach your time limit that you are invisible after turning off Cloak mode, you can still shoot around and might get away with not being seen as they sometimes panic and move around too much to notice you. You can use this to stay in a stationary location that the A.I. does not touch and easily take out a large group, (such as the area directly below a watch tower).
Various Codes
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:
God Mode - g_godMode = 1
No Target - ai_IgnorePlayer = 1
No Weapon Limit - i_noweaponlimit = 1
Unlimited Ammo - i_unlimitedammo = 1
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!
