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Try and remove the inner sliding mechanism, blocked by knobs you can only turn one at a time.

The most common variant uses a red plate and black knobs. There is a variant with black plate and blue knobs. This later version allows one to "reset" the puzzle.
There exists another variant named "Funny Ruler". See the image 4.
If the puzzles state is viewed as a binary number the same "prime directive" applies as with "The Brain": A knob can only be moved if the knob immediately below it (to its right) is set to 1, and all other knobs below it are set to 0 (thus allowing the slider to move such that the next knob to be rotated can be positioned at the necessary location in the sleeve).
Width: 55 mm
Length: 235 mm
Weight: 150 grams

In 2001 Thinkfun (the successor of BinaryArts) made a version with blue knobs shown in image 5. This allows the knobs to be reset by flipping down the end and sliding out the bar.



Thank you to the following people for their assistance in helping collect the information on this page: Joshua Bell, Andreas Nortmann, Brandon Enright.


This puzzle can be found in collections of these members:

Joshua Bell: My Collection
Michael: My Collection
Christoph Lohe: My Collection
Juozas Granskas: My Collection
Andreas Nortmann: Andreas' collection
philipk: My Collection
Darren Grewe: My Collection
wilelsa23: My Collection
sausage: My Collection
Aleksey: My Collection
nicky_uk: My Collection
Ben Hendry: My Collection
PuzzleManiac: My Collection
mamessing: My Collection
howru2day: My Collection
Hidetoshi: My Collection
kastellorizo: My Collection
m0monga183: My Collection
S.Rubiks: My Collection
Frank Tiex: Frank's Collection
Stanislav TVRDIK: My Collection
DLitwin: My Collection
Stephen Blauer: My Collection
kastellorizo: My Collection
Esper48: My Collection
gee3092004: My Collection
a passion for puzzles: My Collection
JasonSmith: My Collection
adeleuw: My collection
solucions: MI COLECCION
demongod: Getting large
TylerMcDaniels: Tyler's Collection
TylerMcDaniels: Tyler's Collection

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