This design is done by Mike Reilly of Flagstaff, AZ.   It has 8 pcs all different which will form the cube.  Each pc has pegs and holes sets positioned on 3 faces.  To assemble you must match pegs and holes to bring the pcs together.  This looks fairly challenging at first glance, but it is even harder than it looks. I rate it a solid level 4.   
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