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A 2D-puzzle transformed into a spherical octagonal prism.
Arcturus is the brightest star in the northern hemisphere.
This puzzle was made by Evgeniy Grigoriev based upon an idea by Dmitry Andreev. He wanted to turn his earlier idea Saldamelik (see the separate entry) into an infinity-loop.
In the standard version (seen here) each circle intersects with 4 other circles.
In the "plus" variant (see the separate entry), the puzzle is additionally cut into two layers along the equator.
In the "advanced" (see the separate entry) version the pattern is more complex.
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