But the most disturbing part is the fact that the sunken ship level ends when you collect a question mark bubble, the only one of its kind in Mario World . In Super Mario Bros. 3 , these were dropped every time you defeated one of the Koopa kids. Maybe one of the Koopalings didn't make it out alive after all ... or maybe none did. Lately, Mario's creator has been pretending that the Koopalings aren't Bowser's children , despite the fact that the manual says otherwise. Perhaps that's his way of saying that Mario murdered all of them, and the ones in the current games are just clones Bowser created to try to fill the emptiness in his heart.