Cheat codes you will always remember.

[Desenova]

There is no Cow Level - StarCraft =) Plus the others already mentioned.

 

[Wolfy4226]

Up up down down left right left right B A, of course.

It's crazy that so many people remember that.

Nah, not really that crazy.

 

[HentMas]

r1-l2-l1-x-left-down-right-up-left-down-right-up

Grand theft auto

i dont even remember what it does, i just remember i used it all the time!

hehehe

 

[Celtic_Kerr]

Up up down down left right left right B A, of course.

It's crazy that so many people remember that.

Nah, not really that crazy.

I think you just became my hero

 

[beema]

IDDQD
IDKFA
IDCLEV##

sim city (forget which one):
oyveyzimer

blizzard stuff:
black sheep wall
make it so
on screen
it is a good day to die
operation cwal

 

[corcus]

"It is a good day to die" warcraft 2

and

"Dwarf" ... from lion king

 

[Scarim Coral]

It had been years since I last play Megaman on the Gameboy but I still remember the password formation (placing the dots in the correct formations) to get to Dr Willy base instantly without beating the rest of the bosses.

 

[Samwise137]

LAIMLAME, LABUG, LAOZ, LAMAXOUT - Star Wars Dark Forces
BEEFCAKE, TUFFY - Star Wars Droidworks

 

[Uncle_Brainhorn]

DULLARD

Anyone remember that one?

Spoiler

Blood Code for Mortal Kombat on the Genesis.

 

[IamQ]

Insta kill and invincible in Warcraft 3 - whosyourdaddy

 

[Daveman]

"rosebud" followed by "!;!;!;!;!;!;!;!;!;!;!;!;!;!;!;;"

Yeah, two semi colons at the end, it says the cheat is invalid but it still gives you the money and the text stays there you can just keep hammering enter and watch the money stack up.

Now for Fallout New Vegas I know that "tcl" in the console is toggle clipping, "tdm" is toggle demigod mode, "unlock" and that's it.

Also I used to know all the weapons cheats for San Andreas and also the code to spawn a jetpack and a jet but I don't know them now.

Oh, and "how do i turn this on"

 

[Ranchcroutons]

simonsays. (Bonus Points if anyone knows where this is from.)
idgod.
idkfa.
thereisnospoon.
I can't think of any more right now.

First one is galactic battle grounds! I loved that game and its killer ewoks!

 

[ulan bator]

IDDQD
IDKFA

 

[Canadamus Prime]

I still remember the level skip code for the NES version of TMNT II: The Arcade Game.
Let's see it went:
A, B, A, B, Up, Down, A, B, Left, Right, A, B, Start

 

[Vivace-Vivian]

I can only remember them with a controller in my hand but...

Vice City, PS2 - All weapons, health, armor, decrease wanted level, increase wanted level.

the other ones are for Sims 1 and 2. Boolprop, rosebud, motherlode...

 

[Pirakahunter788]

simonsays. (Bonus Points if anyone knows where this is from.)
idgod.
idkfa.
thereisnospoon.
I can't think of any more right now.

First one is galactic battle grounds! I loved that game and its killer ewoks!

I know right? It's sorta sad how 1 ewok could take down 5 decimators at once. That's just bad R&D right there. Have 3 and your unstoppable. XD
Remember the easteregg in the corner of the map, on the first wookie mission?

 

[Layzor]

S X O T T X S O T O X S

unlocks all dinosaurs and levels in a ps1 Jurrasic Park game

 

[Zhukov]

helpusobi_1
saberRealisticCombat_1
timescale 0.5

steroids
flying dutchman
ilovethemonkeyhead
robin hood

enter - corn - enter

Aaaaaand... that's it. I've never been one for cheats. They ruin the game for me.

 

[Pirakahunter788]

helpusobi_1
saberRealisticCombat_1
timescale 0.5

Oh hell yes. Jedi Outcast.
Dear god was that game fun. Always loved getting a Jedi and Desann stuck in the ground, and shooting a rocket between them.

 

[Dwachak]

up down left right r1 r2 l1 l2 up down left right
Not the most known code from the game I'm guessing, but it was the only code I allowed myself to use during missions

And rosebud..