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Fantastic and unique puzzle based on a 1911 design. The object is to get each of the 16 columns of numbers to add to 40 at... 
$22.00
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This is a 2 tone version of our Safecracker 50 that uses maple and cherry (both from Maine) as the woods. It creates a very... 
$27.75
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Fantastic design 16 times more difficult than Safecracker 40. The object is to get each of the 16 columns of numbers to... 
$26.00
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An astounding magic trick done with math. This is our design based on math magic from the book, the “Collected works of... 
$19.75
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Want to amaze your friends with your ability to read their mind?? This will do it! There are 6 wood cards, each laser... 
$10.95
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Want to amaze your friends with your ability to read their mind?? This will do it! There are 6 wood cards, each laser... 
$18.95
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Want to amaze your friends with your ability to read their mind?? This will do it! There are 6 wood cards, each laser... 
$22.00
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Can your rotate the rings to get all 6 columns to add to 100 at the same time? Only 1 solution, but 5700 possible... 
$24.00
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3 pieces are arranged next to each other. Can you determine which one is larger? It seems pretty easy. BUT, change the... 
$12.00
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1891 invention that allowed the user to read off the results of simple multiplication problems directly, with no intermediate... 
$45.00
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1891 invention that allowed the user to read off the results of simple division problems directly, with no intermediate... 
$45.00
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Napier's Bones was designed in 1617 by John Napier a Scottish Mathematician. In its day it was a wonderous device that... 
$32.00
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