Pandora's Box

a.k.a. Internal Combustion
Designed by Tado Muroi early 1990's.
(left: "Pandora's Box", Mr. Puzzle Australia, Queensland Blackbean, 3.5x3.5x2.25";
right: "Internal Combustion", Bits and Pieces, Aluminum, 2.25" x 2.25" x 1.5";
described in Boardman's book)

Four burr pieces (two of which are identical) in a frame. Below is a 9-step assembly (6 steps to remove the first piece) based on the piece orientations shown on the right above (except in the photo above the left two have been flipped upside-down for better viewing):

1. 2. 2.
4. 5. 6.
7. 8. 9.

The Solution Sold With Pandora's Box
A 12-step assembly where the piece labeled 3 is reversed from the 9-step assembly shown on the preceding page:

The Solution Sold with Internal Combustion
A 15-step assembly (see also the Boardman book):