Quote Originally Posted by lovablechevy View Post
huh... that's really weird! both of my super mario world and dragon warrior carts work perfectly...
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.