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Brain, The
Above:Starting state
Click a thumbnail to see its larger version and description.
The object of this puzzle is to get all the sliders either in or out. Several stacked and slotted disks inside the puzzle limit the range of movement at each step in the puzzle.

  • Inventor: Unknown
  • Mechanism: Unknown
  • Patents: Unknown
  • Producer: Mag-Nif
  • Year: 1979
  • Original Price: $0.00 USD
  • Current Price: No Data

The pegs are numbered 1 through 8 - peg 1 acts as the 1 bit, or column 0. Peg 2 acts as the 2 bit, or column 1. Peg 3 acts as the 4 bit, or column 2, and so forth. When a peg is pushed in towards the puzzle center, it has a value of 0. When the peg is outwards so that the corresponding flange is extended, it has a value of 1. The mechanism ensures that no peg can be moved either in or out until only the peg immediately lower than it is out and all other lower pegs are in. This is the "prime directive" for this puzzle and its relations, and can be re-stated as "No bit can toggle unless its immediate predecessor is 1 and all other predecessors are 0."
To solve this puzzle one must follow the Gray Code.

In 2009 the puzzle was repuiblished with red plastic. Please refer to images #8-#10.



Thank you to the following people for their assistance in helping collect the information on this page: Dayna Powell.

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