Three columns of a Rubiks Cube exchanged with the columns of an Octagon. The result has a rare symmetry group.

• Inventor: Andreas Nortmann
• Mechanism: 3x3x3
• Patents: Unknown
• Producer: Custom
• Year: 2004
• Original Price: $0.00 USD
• Current Price: No Data

After the Octagon Cube went into industrial production a welth of simple piece shuffles were born. All these variants are made by exchanging the pieces of one or more octagons with the pieces of a standard Rubiks Cube.
This variant represents a subgroup of the group of hexahedral symmetries. This special subgroup is implemented only rarely.
The images shown here steem from the sample made by Andreas Nortmann and presented in 2004. On that occasion the variants name was decided as well.

This puzzle is part of the series "Octgonal Edges". All modifications of this series are made by truncating an 3x3x3 on its edges. These truncations are symmetric as in the mass produced octagon from which the series takes its name.
The technical signature (Octagonal Edges C8000040210) indicates where to cut the original cube.
Without the keyword "Extended" it is a variant made only by truncating the original cube. With the word "Extended" some sides left over from the original receive additional extensions to "delete" some of these remaining faces.
The extended version is "3x3x3 Triangular Prism"

David Singmaster mentioned this variant in Cubic Circular #3&4 from Spring 1982 but made it up as a sketch and didn't give it a name. Andreas Nortmann reinvented it in 2004 and gave it its name.

In 2017 a very similarly shaped 3x3x3 hit the market under the name "Penrose 3x3x3"

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