Wizardry followed the marketing scheme of D&D very closely originally. Parts 2 and 3, although sold as standalone games at regular price, were only playable for veterans of the first one, as they contained no character generation, but only allowed importing victorious heroes. Only owners of the base set were allowed in. After a prolonged break, one could imagine that Sir-Tech may have gone soft and allowed new players a chance at entering this world… unless the big red warnings prominently placed on the box were to be taken seriously, of course.