In physics, a worm hole or time slip is a hypothetical feature of space time that is basically a shortcut through space and time (although a time slip is just a shortcut through time that may take one backwards or forwards). Worm holes are a feature of both the Mario franchise and the real world. In the real world, they look almost exactly like black holes.
In the Club Nintendo comic "Super Mario: Verloren in der Zeit" Mario was transported through time and space to places such as Hösndösn with the use of a time slip. A worm hole was also used in the N-Gang comic "Freeze Frame" where Big B. was transported through a worm hole to the icy landscape that featured the ice castle.