I currently own 19 NES games, none of them being Tengen titles. I'd like to have at least one black Tengen cart in my collection. Tengen Tetris would be a sweet find, but we all know how to tough it is to acquire a copy and I doubt I'll find one soon (although I'm hoping I'm wrong on that).

Anyways, other than that, I don't know much about the good Tengen titles out there, so I'm turning to you guys.

What do you recommend?