Age of Empires 2

marco- all map explored

polo- fog of war eliminated

cheese steak jimmy's- 1000 food

lumberjack- 1000 wood

robin hood- 1000 gold

rock on- 1000 stone

torpedo- type # of desired player, no spaces after torpedo, to kill that player

black death- you win instantly as everyone dies

wimpy wimpy wimpy- you die utterly and completely and lose

Now for the fun ones:

natural wonders- become nature, hawks explore but aren't units, if all land animals die you lose, even deer can attack by nibbling

to smithereens- summon petard, a suicide bomber

how do you turn this on- summon car with machine guns

i love the monkey head- summon a naked man that runs faster than anything, even the car, crosses biggest maps in seconds, does nothing else whatsoever

I'm a dirty, dirty cheater. I'm sure I missed one, though. Know what's fun? Open chat, enter the car code but don't enter, instead ctrl+c to copy first, then just enter, ctrl+v, enter, as fast as you can, army of cars in a minute, raze entire maps without moving your starting villagers. Never gets old.

Edit: remembered some more

aegis- everything builds and researches instantly, for you and your enemy

i r winner- win without killing anyone

resign- lose immediately without dying

I think I'm still missing some, but those were all the ones I used, for the most part.

I used to use Gameshark

Shinmue
FFVII
FFVIII
RE3
Omega Boost

You never tried the "how do you turn this on"? I think this is the best cheat available in the game. 

Blue, orange, yellow, orange, blue, orange, yellow, yellow

Also, "godofgta".

Is that the one that makes some car appear?

007 373 5963 Code to fight Mike Tyson

Konami Code uuddlrlrbaba

That is all that comes to mind. Also using the second controller to cheat like hell in Mega Man 3.

Yep, they are called Cobras if I'm correct. I really never finished the last missions of each campaign in Maximum diffculty without using them.

I remember my cousin taught me that code because I was being wrecked by the Ottoman turks in the Lepanto scenery from The Conquerors

Some that I remember (too lazy to type them all out)...

Konami Code (obviously)
Justin Bailey Metroid code
Kid Icarus skip to the end code
Zelda 2nd quest code (duh)
Banjo Kazooie sandcastle codes
Star Wars Shadows of the Empire debug code
Weapons / ammo / health / various cheat codes for GTA III / Vice City / San Andreas

Bloodrayned 2 -- Juggy mode: Fake Bust Cunningly Distorted

Konami code became ingrained into my muscle memory.