There is a new mechanical puzzle on the market called Friend Puzzles .
It is a 3 piece coordinate motion puzzle game. Object: Put the 3 parts together. $ 75
From what I've seen on the Kickstarter website, it looks like Kuku who has been out for at least 7 years. Sonic Games: http://www.sonicgames-uk.com/isis-adventure/products/kuku-puzzle/58
is manufacturer of Kuku. Kuku is soon back in the market and you can buy one to 150 pounds. (In the last international jigsaw puzzle, I sold my copy for $ 75 to an old friend. I told him it was a good deal!)
As a co-ordinator, the Friend Puzzles looks quite simple. Carefully raise the pieces. Your dignity is important! And voila.
Kuku is much better because it has 3 inner pins. You can solve it with 0, 1