Octaplex 1 by Bob Hearn

This awesome puzzle was Bob’s IPP 35 Exchange puzzle at Ottawa, Canada in 2015.

Here’s Bob’s description:

‘A Puzzle from the 4th Dimension’

“The 24-cell, or octaplex, is one of the six convex regular four-dimensional polytopes, analogs of the five Platonic solids. OCTAPLEX I is a perspective projection of an octaplex into three dimensions, dissected into five pieces made from the octahedral unit cells.

Goal: Assemble an octaplex.

Extra: Arrange the pieces in sequence so that each step either adds or moves exactly one octahedral cell. (Note: the cell shape can change as it moves.)”