So far I've obtained Pac-Man, Fantasy Zone, Rolling Thunder, Gauntlet, and this game:

What can I say, I'm a sucker for amusing labels. I actually thought Tengen Toobin was entertaining, but I can't really compare the port to its predecessor since I never had a chance to play it.
I've also heard that Tengen Tetris is pretty rad, though I have yet to see a copy that isn't overpriced (unless it's really worth it).
