sentence meaning - What does "black sheep wall" mean?

It's a cheat code from StarCraft to reveal entire map, but different from other cheat code, it's really hard to understand.

I can understand most cheat codes:

• show me the money - get a lot of mine and gas


• whats mine is mine - get some mine(a pun)


• breath deep - get some gas

...

So, what does "black sheep wall" really mean? Is there a story behind it?

Answer

Black sheep wall itself is not an idiom or saying in English like many of the other cheat codes.

However, a black sheep is a family member who does not live up to the parents' or family's expectations. Or one kid who "goes bad" while all the other kids do great. It could be that the wall lets you see all the black sheep (i. e., the aliens).

There is a song "Black Sheep Wall" by The Innocence Mission. The album that the song is on was released in mid-1989, years before Starcraft was first released, March 1998. Some Starcraft fans say the cheat code refers to the song title. The song is, here on YouTube and you can Google the lyrics yourself.

There is now a band called Black Sheep Wall that is allegedly named after the cheat code.