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A face turning truncated tetrahedron with 8 turning faces.
Not very much is known about this hand made puzzle. Even the name "Concept 5" is not verified. The turning is similar to a Master Tetraminx and Dayan Gem VIII but it’s not as deep. That can be seen by the stationary triangular center pieces. The name was given because of the strong resemblance to the ''Concept 11'' but with less faces.
The inventor is not a forum member and wants to stay anonymous.
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Thank you to the following people for their assistance in helping collect the information on this page: LinerPZ.
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