The
code that works on a lot of the action games
Konami made for the
Nintendo Entertainment System. It's also the only way some people could beat
Contra. The code goes as follows, and must be entered before at the start screen before the demo begins:
Up, Up, Down, Down, Left, Right, Left, Right, B, A, *Select, Start
*Only hit select if you want a two player game.
This code provides the following benefits (only listed the games I owned):
Contra - 30 Lives
Life Force - 30 Lives
Gradius - Full weapons, shields, and two Options
Castlevania - doesn't work
Jackal - doesn't work
I'm told this works on a whole bunch of GameBoy games, too.
Despite what some people tell you, you DO actually have to hit B and A... otherwise you get nothing.