Quote Originally Posted by remowilliams View Post
Yeah, I think it is probably an issue with the specific cart/connectors that isn't mating quite right with the RetroDuo, and that the GGs alleviate it.

I'd still like to know why Rolling Thunder carts have been reported as not working (mine too) but I can play it from the PowerPak just fine.
Might have something to do with the hardware or pins on the Tengen cart.