Windu, its called the single player random map (which is played a lot more and a lot longer than the campaigns) or multiplayer (ditto to the first comment). Campaigns atleast have to have the semblance of corretness. Unless you don't what either of those in your game, denying the player a lot more freedom than not having your cheap ripoff on top of the other campaigns.
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former."-Albert Einstein