Numberjacks Wiki

The Brain Gain Machine is a machine that is used by Numberjacks to solve problems. It's located in the Control Room.

The Brain Gain Machine is a purple machine with six pillars containing a green liquid-like substance, called "Brain Gain", which is made from the thoughts of the Numberjacks, the agents, and the viewers. On the top is a blue six-legged spider-like figure with wires attached to the ceiling.

When the machine is turned on, the walls turn from opaque to transparent, and the center platform lowers to the ground for a Numberjack to get in the machine. The six-legged figure flickers, bounces, and raises one of each of its legs at one time. Then it rolls its "arms" and sucks up the brain gain liquid into itself, and the pillars now contain purple "electricity" inside.

When a Numberjack hops onto the center platform, the electricity from the machine bolts out of the house and into a Numberjack on a mission to sort the problems.

Sometimes a Numberjack can cause a mistake in the machine or overflow with brain gain, which causes more problems in the real world. Other times, putting objects in the Brain Gain Machine can help make Brain Gain.


  • There is only one episode where the Brain Gain Machine is not used, which is 1, 2, 3, Go.
  • In Hundreds And Thousands, instead of the numberjacks using the brain gain, it was the agents.

Theme Song Lyrics

♪ Brain Gain, Brain Gain, to sort a problem use our brain ♪

♪ The way to get your brains all linking up together, joined-up thinking ♪

♪ Getting brain power now! Brain Gain! ♪

Biography by Three, the Narrator

This biography is about the Brain Gain Machine.

The Brain Gain is inside the Brain Gain Machine. It helps Numberjacks think to solve a problem with joined-up thinking. In Off Colour, Four was transparent. It can sort out all kinds of things. It can also sort out problems.