The Konami code. This was originally used on the SNES to receive nine lives in Contra. Commonly people add start to the end of the code; however, this is not necessary it was just so people would un-pause their game.
If you're having trouble with Contra use the Konami code man, it's up up down down left right left right B A. It's that simple.
by Corn Is Tasty July 14, 2009
Famous video game cheat code. Originated in Contra, then reappeared in Gradius (1988). All video game fanatics know this code by heart.
Up, Up, Down, Down, Left, Right, Left, Right, B, A, Start.
by Myoga1 February 24, 2004
This is actually known as the "Konami Code", as it appeared in pretty much every game they wrote at that period of time.

Don't forget, make the end of it "Select, Start" if you want to play 2 players!
"FUCK, LifeForce is a real bitch. Let's just Konami Code it... and pass that pizza, asshole."
by Binary Jay November 25, 2004