Metal Slug 2

I just got a Metal Slug 2 homecart today and i was playing around with the Bios Debug Menu but i cant really understand much of it. Does anyone know if there is anyway to unlock hidden stuff like there is with Metal Slug X?

I know there's hidden things in the CD version of MS2 that you can access with the NGCD emulator. Actually, it has test stages and other things that look like they were later put in MSX and MS3! However, I'm not sure if they're in the cart versions.

<font face="Verdana, Arial" size="2">Originally posted by ShinGo585:
I just got a Metal Slug 2 homecart today and i was playing around with the Bios Debug Menu but i cant really understand much of it. Does anyone know if there is anyway to unlock hidden stuff like there is with Metal Slug X?

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Damn I love that game, brings back memories

Ive been playing around with it more and There are alot of test stages and stuff, but most of it just looks like the levels of MS2 before they were completed. Pretty cool, but i was hopping for a hidden stage or 2.