Oblo Sphere offers long play time.
Like Russian Matryoshka dolls, opening one layer of the Oblo Sphere leads to another and then another until you've reached the fourth, smallest, piece inside. All the real fun begins when you have to position all the portions of the sphere shells in just the right order to rebuild it to its original shape—constructing a sphere within a sphere. The 3-D spherical puzzle is recommended for ages 5 and up. $19.95. Great Circle Works
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