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A 4x4x4 truncated on all eight corners but not in identical depths.
This is shape transformation is an incomplete corner truncation. As it would be done for a cuboctahedron all eight corners of the original puzzle are truncated but two corners not so deep as the other six. The resulting shape as six rectangles which explains the puzzles name.
Parallel to this sample the creator built a variant from a 3x3x3 which is named "Tri-Rectangle Twilighter" (without "Big").
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Thank you to the following people for their assistance in helping collect the information on this page: Andreas Nortmann.
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