In this video you can see at 0:18 that I have 8 lives, but pressing "start"+"up" gives what seems to be 17 lives.
At the end of the video you can see it's not 17 but virtually infinite lives.
I keep dying over and over again to show that to you.
I accidentally discovered this when I was a little kid playing in my NES clone console with my Contra Force pirated cartdrige (yep, chinese stuff).
This hack name is Super Contra 6 and the cheat doesn't work with original Contra Force. In Contra Force we have infinite continues when we loose all of our lives.
Sorry for my bad english =)
![](https://i.ytimg.com/vi/xE8Yo2pW_Sw/mqdefault.jpg)