Earlier when I was talking about Q-Transformers, I mentioned the eternally frustrating Mystery of Convoy on Famicom. While the game is impossibly hard and probably really bad for your blood pressure, I won't deny the various marketing for it was really cool. There's random promotional artwork to be found as well as the great box art for the game itself. Then there's the manga that serves as guide to the game. Of course there's the commercials, but check out this rad promotional video Takara produced.
It's pretty hardcore.