I need help on that. I have noticed that my DS L and R don't work in Mario Kart before but it never really bothered me that much as I usually chose Dry bones and he has good handiling. But yesterday l bought Mario and Luigi Partners in time and then got to the part where you fight the Hammer Bros. after that they give a hammer and in order to continue you have to switch actions with the R button. So thats why I need The help I mean sometimes it works but it rarley does.