CONTRAAA!! THE ARCAAAADE VERSIOOOONNNNN! (I'm singing this by the way).
Look, I honestly don't know which came first, the arcade version or the Nintendo version...and I'm too damn lazy to look up the information. So I'll just say that the game plays a lot like the NES version. But there is something less fun about it. I don't know what it is. I can't really articulate it. So I won't even bother trying...maybe it's the fact that you can't do the 30 lives cheat.
I mean, you're still a man with a gun shooting his way through some evil empire. Killing thugs and stealing their guns. Different guns have different effects. And You still travel through corridors killing electronic eyes and soldiers. You work your way through cliffs and hideouts, shooting anything that is blinking or with an Eagle on it...because we all know that any nation with an eagle as it's symbol is automatically oppressive and evil (If your nation has an Eagle as it's symbol, please feel free to be offended by this statement...yes, I'm talking to Americans and Nazis).
So yeah. It's Contra. It's fun. But not AS fun as the Nintendo version. I don't know why. Stop yelling at me. The end.