A Stepper Box is a device that is used to step from one planet to the next in a chain of parallel worlds, such as the Long Earth.

Inexpensive and easy-to-build, it is made of a couple of wires, basic electronic components (easily found at any Radio Shack), a switch and a natural power supply (a potato for example).

The Stepper Box (or just ‘stepper') has a three way switch on top of it, one marked ‘west', one 'off' and the last 'east'. 'West' and ‘east' are the names given to the two directions of travel possible through parallel world chains - flicking the switch to either causes the user to be transported one planet in that direction.

The Long Earth

The day Willis Linsay uploaded the circuit diagram for the Stepper Box on the internet is commonly known as Step Day. Kids from all around the world started building Steppers and disappeared.

The Long Mars

In The Long Mars, is it revealed that the Steppers also work on Mars. Compared to their Earth analogs, the Mars Steppers have to be powered by Martian cacti instead of a potato.

The High Meggas

In the universe of The High Meggas, the device that allows travel between Long worlds is the belt. Belts were invented by Lider, and perfected by Larry Linsay. They are powered by "batteries".[1]


The Long Earth by Terry Pratchett & Stephen Baxter - Willis Linsay's original 'Stepper'00:32

The Long Earth by Terry Pratchett & Stephen Baxter - Willis Linsay's original 'Stepper'


  1. A Blink of the Screen: Collected Shorter Fiction - The High Meggas

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