↑↑↓↓←→←→ B A START That's just a little secret from me to you. Use it wisely, traveler
Post
Like maple's post if you didn't know the Konami code before you saw it.
↑↓↑↓←→←→ B A B A Select Start is what worked in Contra.
the contra konami code has one set of B A and pressing the select button before start sets it to multiplayer