Planet 9 - Math Puzzle Book
$7.97
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Enjoy hours of brain-boosting fun with the new PLANET 9 number puzzle. PLANET 9 is a mathematical cipher whereby digit sum addition is used to determine hidden values. Each puzzle consists of two orbits with 9 circles in each orbit. There are several numbers missing from each of the inner and outer orbit circles. The objective is to figure out the values of the missing numbers.
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