Worm hole
- Not to be confused with Wormhole.

In physics, a worm hole or time slip is a hypothetical feature of space-time that is basically a shortcut across it (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 Super Mario franchise and the real world. In the real world, they look almost exactly like black holes.
History
Club Nintendo
In the German Club Nintendo comic "Super Mario: Verloren in der Zeit" Mario is transported through space and time to places such as Hösndösn with the use of a time slip. A worm hole is also used in the N-Gang comic "Freeze Frame" where Big B. is transported through a worm hole to the icy landscape that features the ice castle.
DK: Jungle Climber
Worm holes appear in DK: Jungle Climber, where they are used to transport Donkey Kong to different worlds. There is even a world called Wormhole.
Super Paper Mario
In Super Paper Mario, worm holes called Squarp holes appear in Outer Space. Squarp holes teleport a player from one part of a level to another, similar to Warp Pipes.