Start the game with the -DEVMODE command line parameter, then activate the following cheats by pressing the corresponding keys:
CHEAT FUNCTION - KEY Toggle first and third person view - F1 Jump to next checkpoint - F2 Toggle fly and ghost modes - F3 Toggle God mode - F4 Jump to previous checkpoint - F10 Get missile launcher, shotgun, alien MOAC - Keypad 1 Unlimited ammunition - Keypad 2 Debug menu - Keypad Ente
To start the game without the intro videos, rename the following files in the "\Crysis\Game\Localized\Video" directory: "Trailer_NVidia.sfd", "Trailer_Intel.sfd", "Trailer_EA.sfd", "Trailer_CrytekC.sfd", and "Trailer_Crytek.sfd".
When attacking 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), immediately 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 couple 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 may get away with not being seen as they occasionally 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).
In level 2 "Recovery", under the Delta difficulty setting, you can find rocket launcher at the roadblock where there is a truck full of KPA. There is also a rocket launcher and a Precision rifle leaning by the back wall outside of the house at the radar station. There are at least two rocket launchers at a small white building adjacent to the town hall (KPA HQ). There is a rocket launcher at the gas station cash register. Along with the rocket launchers in the school, those two tanks are easy to destroy. There is also enough Precision rifle ammo at the second floor pillbox of the KPA HQ to max out your capacity.
Note: This procedure requires editing a game file; creating a backup copy of the file before proceeding is recommended. With a text editor, edit the "diff_easy.cfg", "diff_normal.cfg", or "diff_hard.cfg" file in the "\crysis\game\config\" directory to enable cheat mode and the console window under the Easy, Normal, or Hard difficulty settings. Add the line "con_restricted = 0" to the file then press ~ during game play to display the console window. Activate the following cheats by entering the corresponding codes:
CHEAT FUNCTION - CONSOLE CODE OR LINE IN .CFG FILE God mode - g_godMode = 1 Unlimited ammunition - i_unlimitedammo = 1 Spawn indicated item - i_giveitem 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, "4" is most difficult - g_difficultyLevel = 1 AI ignores player - ai_IgnorePlayer = 1 No weapon limit - i_noweaponlimit = 1 Speed suit never runs out of energy - g_suitSpeedEnergyConsumption = 1 Unlimited nightvision - hud_nightVisionConsumption = 0 Faster nightvision recharge - hud_nightVisionRecharge = 999 Rate at which time passes; "1" is default - time_scale = Toggle melee attacks while sprinting - g_meleeWhileSprinting = <0 or 1> Fall speed in meters/second that causes death; "13.7" is default - pl_fallDamage_SpeedFatal = Maximum speed in meters/second at which you take no damage; "8" is default - pl_fallDamage_SpeedSafe = Set swim speed; "4" is default - pl_swimBaseSpeed = Set speed at which you jump out of water; "1" is default - pl_swimJumpSpeedBaseMul = Walking movement speed; "1" is default - g_walkmultiplier = Toggle vehicle invincibility - v_goliathmode = <0 or 1> Multiplies punch strength by this factor; "1" is default - cl_strengthscale = Koreans speak in Korean - ai_UseAlternativeReadability = 0 Toggle frame rate display - r_displayinfo = <0 or 1> Alternately, use a text editor to edit the "diff_easy.cfg", "diff_normal.cfg", or "diff_hard.cfg" file in the "\crysis\game\config\" directory to change game play under the Easy, Normal, or Hard difficulty settings. Enter the following lines to get God mode and unlimited ammunition. This may also be done in the demo version of the game.
To kill Alien Troopers without shooting, do the following. 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 stay 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).