Perplexus Original Spiral
\n\tJust past the midpoint, moves 65 and 66, involve the large spiral at the center of the sphere. You will use both sides to successfully continue to move 67.
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\n\tFor more details, read my Geek Gifts 2011 review of the Perplexus Original 3-D puzzle toy.
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\n\tScreenshot by Wally Bahny for TechRepublic.