secret worlds: creche transit
You can access this secret world if you have the hazard shield. Starting from the top, do a spring-bsj from one of the walls near the grab ledge and screw attack past it, making sure to stay over the two bars. Unlike most places, it's okay to mash B here in order to maintain the same height; staying over the bars is more important than getting distance. When the screw attack ends, you should land on air and be in the secret world.