Four pieces, a couple of spare voxels inside somewhere. Lots of ways to assemble some of the pieces...and no way in heck of getting the final piece into the right place. It definitely requires some thinking and it rewards experimentation and rigour, and everyone I’ve given it to so far has not only solved it, but enjoyed solving it. You can’t really ask for more than that!

Construction of this puzzle is very good. Fit is a bit loose to compensate for dry shop conditions...don't want this one to lock up when subjected to a little humidity!

36 copies made for sale, each signed and dated. This puzzle is shipped disassembled.