Contra XBLA video
 

i found this video over at gamefaqs where this guy beat the game with 1 credit and didn't get a gameover. If you downloaded contra on xbox live arcade for 400 points, u have 2player co-op and achievements.. One of them is bulletproof or something where you have to beat the game without getting a gameover. Nuff said. Enjoy!

http://www.youtube.com/watch?v=rMxTlnCX_S8