The SELECT button was used if it was a two-player game. Otherwise, the code was up, up, down, down, left, right, left, right, B, A, start.
It wasn't just for Contra, either. It worked with several Konami games, most notably, Lifeforce. And I think a similar code worked for Super C, or whatever the sequel to Contra was.
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"I need to catch a couple of killer, monster hands and have two or three callers."
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