Actually, Tengen made games for Nintendo just like any other developer at first, their games were regular grey ones like all the rest. Then Tengen started making their own carts, and those are the black ones. Besides, the dark lines aren't from the game, it's because the new style NES uses a NES-on-a-chip, which is of lower quality than having every chip seperate like a regular Famicom or NES.

> remember, Tengen didn't get the ok for any of their games, they'd just produce
> crap title after crap title. Who could forget Gauntlet how it would give you
> fake passwords. But anyways, its cause Tengen wasn't a licensed Nintendo
> developer, that would explain those ugly assed black carts they had. I imagine
> anything by Color Dreams and other non-licensed games to have the same affect.
>
> I came to kick ass and chew bubblegum, and I'm all out of bubble gum.
>