It's blatantly stolen: it's from Perplex City, an Alternate Reality Game that I've been playing. Short summary: you buy these cards with puzzles on them, and you can keep an account on their website, enter answers there to the puzzles, and score points thereby. Oh, and if you figure out the "boss puzzle", you win $200,000.
But enough about that. This particular card has a list of cheat codes from time immemorial, and the goal is to determine the games the cheat codes are from. I will try to duplicate as much as possible the look of the cheat codes here; if you want to see the card in its original form, I recommend this link.
Note that for this to be any fun, you have to remember the cheat codes yourself; there's several places online with the answers now. (Amusing side note: before the solutions to this puzzle were put up, it was a clever inverse problem. Knowing a game, it's easy to find the cheats, but given the cheats, not easy to find the game.) If you're just dying of curiosity, answers are available here, here, or even here.
The Cheat Codes:
1. UP UP DOWN DOWN LEFT RIGHT LEFT RIGHT [START]
2. DOWN Z UP X A Y B C
3. [FUND] [FUND] [FUND]
5. Alt+Shift+Control+C, klapaucius
6. LEFT RIGHT LEFT RIGHT LEFT LEFT RIGHT RIGHT A
8. L1, TRIANGLE, R2, L2, L2, R2, CIRCLE, L1
9. Origin - k
10. POKE 14711, 165 / SYS 8192
I always viewed these kinds of alternate reality games as make-work, but this one's a little interesting at least.
#1 is NOT the Contra code, that has a B-A at the end of it. I thin this version is the Level Select code from Sonic 2, that had to be entered with just the right timing.
#2 has to be a six-button Genesis game.
#4 is the famous Doom cheat code.
#10 must be a Commodore 64 game.
3 should be SimCity
7 could be one of many games, but I recently played "Another World" and it used a four letter password system. It could be one of those games.
6 feels very familiar, but I can't pinpoint it.
2 could be SF2 for the Genesis. I remember a similar code on the SNES that you entered during the "Capcom" logo -- I think it might have been the one that allowed you to go beyond 4 stars on Turbo??
8 is a obviously PS2 game, no idea which one.
5 is sims