What cheat codes have remained in your memory to this day?

[Burning Typhoon]

Yeah. I remembered the cheat code to play as red venom in Marvel Vs. Capcom. From Chun-Li, right, down,down,down,down, left, up,up,up,up,right,right,down,down,left,left,down,down,right,right,up,up,up,up,left,left,up.

I found out I had it memorized all the way back in the fifth grade. Now, I just use red venom whenever I feel like being cheap in the game.

I also remember Roll's code.. Don't think she's all that great, she's just.... easy to remember. Though I still use her online from time to time with megaman. From Zangief, left,left, down, down, right, right, down,down, left,left, up,right,up,up, right, right.

If I had GWM's in memory, I'd use him more often.. Sadly, I don't know that one, and forget to look it up.

I remember the cheat in GTAIII to change the player's model. Right,down,left,up, L1, L2, up, left, down, right.... I used to use a bunch of cheats in GTAIII when I was younger. I had the weapons, tanks, wanted level decrease... everything in memory. Now, I just know the one.

I also remember the dipswitch mode from MKII on sega genesis... Highlight options. Left,down,left.Right,down,right, left,left, right,right.

I also know the level select, and debut modes from Sonic the Hedgehog. I always forget the codes for sonic 2. And Sonic 3 is stupidly difficult. But, I know the debug and level select for Sonic 3 & Knuckles. I usually save that for when my save data has disappeared somehow.

That's all that comes to mind for now.