There is another mechanical version shaped with these 2 loops.
Look up: Moeraki Games on the app store. There are three different versions. One is the Lite version. Another is $.99. The best of course is the full version at $2.99. Check out how intricate those puzzles are.
In the case of Casland Games' Moeraki puzzles: I want them all!
One more thing: when you buy the mechanical version, it will come with a DVD that will install the game on your computer.