Metal Slug - select stage

If you are using the debug bios (not universe bios) it is possible to go into the developers options in that and choose your stage, that's the only way I know how to do it, and I think you would have zero points that way. I don't have it though, and I can't post rom links here, so you'll have to find it from somewhere yourself and give it a try

Hope that helps,
Kaz