I-War:
Select All Missions: search for the file "prec" in directory \iwar\psg\resource\scripts\precedence. open the file with a text editor and change all numbers in the row "prec" to 0 (zeros).

Icarus:
Kill enemy with 1 hit type "Baby" before attack.
Preserve HP/MP type "Waac" before attack.
Gain Money "Jjun".

Incubation: Time Is Running Out:
ix1: makes all locations visible.
ix2: grants ten skill points for each marine.
ix3: grants five hundred equipment points for your squad.
ix4: advances you to the next mission.

Incoming:
You type NUMBERONEDACRESTREET at the main menu it brings you to a menu and you can get many cheats from there including 5 new secret levels...
*Hold down SHIFT and type:
WIREWEWAITING - Turns off the textures
WHATSTHEPOINT - Turns graphics to the dots
SOLIDASAROCK - Invulnerability
FLATBROKE - No shading
GOURAUD - Gouraud shading on
OLDMACDONALD - Protect farm from jumping COWS !!!
FLYMETOTHEMOON - Racing in the moon
HAVEALL - You got it all
SUPERDAISY - One shot kills 'em all
SUPERSHOOT - Same as SUPERDAISY
INVUNERABILITY - That's just what it seems
INFINITELIVES - And so is this one
INFINITEWEAPONS - Infinite weapons
MASTEROFTHEUNIVERSE - Atleast it changes textures on & off
CHEATKEYS:
*Function keys turn cheats on&off
F2 Easy Shoot
F3 Invulnerability
F4 Infinite lives
F5 Infinite weapons
F6 Smart bomb
F7 Quit
F8 Stores current situation
F9 Reloads stored situation
F10 Frame wait on/off
F11 Restart

Ignition:
*Enter the following cheats at the title screen to toggle them.
BANARNE: stretches all cars upward.
FILMJOLK: continually flips the screen.
SKUNK: displays the wheels of your car only.
SLASKTRATT: grants access to all cars.
STRINGS: flattens all opponents cars.
SURMULE: grants access to all tracks.
SVINPOLE: drops the camera viewpoint.

Imperium Galactica:
*Hold down SHIFT while typing KAROLY to activate cheat mode. Press the following keys to activate the respective cheat.
5: promotes you to lieutenant.
6: promotes you to captain.
7: promotes you to commander.
8: promotes you to admiral.
9: promotes you to grand admiral.
C: gives all colonies and inventions.
V: adds one hundred thousand credits.

Inca:
CTRL-ALT-LEFT SHIFT: gives full energy while in space battles.

Incoming:
Type NUMBERONEDACRESTREET in the main menu. The menu will then change and you will have access to various cheat options.

Incubation: Time Is Running Out:
ix1: makes all locations visible.
ix2: grants ten skill points for each marine.
ix3: grants five hundred equipment points for your squad.
ix4: advances you to the next mission.

ID4: Independence Day:
*Enter one of the following names as your "Player Name" at the main menu. Exit back to the main menu and press CTRL-RIGHT SHIFT-8 to enable the cheat menu.
BRENDAN QR: enables all cheats.
DAB DAB: enables all cheats.
DOOFUS: enables all cheats.
FOX ROX: level select.
GO POSTAL - gives damage bonus, all weapons and fast reload.
GODZILLA: kill civil, kill wing.
GREG FM: enables all cheats.
KIWI: enables all cheats.
KYRA NR: enables all cheats.
LIVE FREE: grants invincibility.
MR HAPPY: plane select.
RADARMY: enables all cheats.
ROSA DUONG: enables all cheats.
SCOTTYWAR: enables all cheats.
TOURIST: level select.
TRI S: enables all cheats.

Indiana Jones And The Fate Of Atlantis:
Depress the INS key during any battle to instantaneously defeat your foe.

Inferno:
1) Depress RIGHT SHIFT while typing LOLIFE to gain invincibility and unlimited weapons.
2) Pause your game by depressing ALT-P and use keys 1-7 to gain the corresponding combat pods.

Interstate '76:
CTRL-SHIFT-GETDOWN: level skip (after enemies pound you...).
THIRDNOSTRIL: removes targeting range limits.
WIGGLEBURGER: causes the screen to shake.