Star Wars Episode 1: The Phantom Menace (PC)

During gameplay, press the BACKSPACE key. Then type in the following codes in the dialogue window:

give me life: Full health
iamqueen: Play as Queen Amidala
iamquigon: Play as Qui-Gon Jin
iampanaka: Play as Panaka
iamobi: Play as Obi-Wan
naughty naughty: 1st person view
perf: Wire frame view
rex: Wire frame menus
slowmo: Slow motion mode
60fps: 60 fps rate
fps: View frame rate
perfection: Auto-Fire and attack
where is gurshick: View credits
i like to cheat: All weapons and full ammo

To get all weapons and unlimited ammo pause the game and then highlight the weapons option. Then simultaneously press:
RIGHT + L2 + R2 + CIRCLE + SQUARE + X: After you enter this you will be brought to the weapon selection screen.

To be able to perform the level select cheat, pause the game and then enter the options menu. Then go and highlight the Select mission then press and hold:
LEFT + R1 + L1 + SELECT + SQUARE + X: You will then be able to select any level.

To make your opponents weak, pause the game and highlight the map option and press:
RIGHT + L2 + R1 + X: If you entered it right you will hear a laugh

SiN (PC)

Simply press the tilde key (~) then enter any of these codes:

/superfuzz: God mode
/health 999: Gives you all weapons
/nocollision: No clip mode
/wallflower: No target
/spawn magnum: Gives you the magnum
/spawn shotgun: Gives you the shotgun
/spawn rocketlauncher: Gives you the rocket launcher
/spawn heligun: Gives you the big gun from the chopper
/spawn reactiveshields: Gives you the Reactive Shields
/spawn rockets: Gives you rockets
/spawn coin: Gives a coin
/spawn health: Gives you a health pack
/spawn cookies: Gives you a pack of cookies!
/spawn lensflare: Creates a light effect

Shogo: Mobile Armor Division (PC)

Simply press the T key for talk, then type in these codes:

MPGOD: God mode
MPKFA: Full ammo, armor and health
MPHEALTH: Full health
MPAMMO: Full ammo
MPARMOR: Full armor
MPCLIP: Clipping mode on/off
MPPOS: Show position on/off
MPCAMERA: Adjust camera on/off
MPLIGHTSCAPE: Adjust light scape on/off

Caesar 3 (PC)

Start the game, then place a regular well on the map. Next, right-click the well and then press and hold the ALT and K key. This enables the cheat codes.

ALT + C: Gives you more cash
ALT + V: Promotes you and allows you to play the next map

Head Extreme Destruction Zone - H.E.D.Z (PC)

During the game press the T key to bring up the message prompt. Then type the following:

OH MY GOD: Allows god mode
TOO HARD FOR ME: Turns the AI off