This is a set of six cards released by the National Safe Kids Campaign, a national organization that deals with such public services as product recalls on children's products and encouraging kids to buckle up and wear bicycle helmets and the like - essentially, to encourage the existance of "safe kids", I suppose. So what are they doing releasing a set of Nintendo trading cards?
A complete set only has six cards, and considering these things were bagged 24 packs to a bag it's not especially hard to find a complete set. It's worth it to be able to read Mario's diatribe against unsafe stairways!
Thx: Alan Davis