There was a code you entered into Contra for NES to get 30 extra lives. You entered it with the controller. What was it?
↑ ↑ ↓ ↓ ← → ← → B A Start
or for 2-player
↑ ↑ ↓ ↓ ← → ← → B A Select Start
(technically, the "Start" and "Select, Start" are not part of the code, but are necessary to start the game)
The Konami code.
Technically the code is:
- up up down down left right left right b a
and select changed the mode to two players, and then start started the game, but the "[select] start" is generally referred as part of the code. This code is referred to as "The Konami Code", "The Contra Code", or simply "The Code"
Another representation of the code, which is responsible for me knowing it by heart without ever having played Contra: The Gothsicles - Konami Code IV