sandra lee has more on how spiderman is using his special power to brighten the days of children withe custom-maze suit. one section at a time. >> my main goal is to bring happiness. >> reporter: in a dining hall, dozens of children wait eagerly. >> can you sign it? >> reporter: from a visit from a superhero. these children suffer from a life threatening disorder where their blood doesn't clot, often limiting them from physical activity that is other children enjoy. >> there is no guarantee of tomorrow and kids are smart. they know what they are involved in. >> reporter: but this spiderman from pittsburg tries to save the day by transporting children who have serious medical conditions. >> i can't cure them, but just to give them a moment of peace. they still have their imaginations intact. >> reporter: into a world where they have powers, a dream worth living. >> i want to change the world. >> for me, they are able to walk in. it makes them feel like wow, my superhero came to visit me. >> reporter: a transformation that comes along with the all- important custom cake made by voluntee