Solution for the Quadraplank 12x3D puzzle
These beautiful images that depict the assembly process of the
Quadraplank 12x3D puzzle were created with
povray.
Identify the first two pieces and put them together in the level 3 move
depicted in the following four images.
Move the second piece to the left.
Move it down.
And, again, to the left.
Now find the next two pieces.
The front-most cube of the bottom piece must touch the plank that
extends to the right from the top piece.
Hold the pieces together by the cube and plank and then move the
plank (that you're holding) from the back between the two
"front-to-back" planks of the previously assembled pieces.
Move them as far to the front as they will go.
The next move is a rotation that is only 98% allowed (depending
on the thickness to width ratio of the planks) :-)
Move the piece that you were holding by that cube to the front.
Find the next piece and slide it in from the left, but not all the
way. Leave it out by the size of a cube plus the thickness of a
plank.
Find the next piece and slide it in (all the way) from the back.
Now move the before-last inserted piece all the way in.
Now assemble the remaining six pieces (these are the mirror
images of the six you've now used) into the mirror image of
the object you've assembled so far.
Join the two halves to complete the assembled cube.
A more close up view.
That's it.