![](https://cdn.shopify.com/s/files/1/0441/2748/6119/files/hands_1024x1024.jpg?v=1627000460)
The tetra puzzle started as an intuition: A tetrahedron (pyramid) has four corners and four faces, so there was a gut feeling we could break it up into four equal parts and build a puzzle from that idea.
![](https://cdn.shopify.com/s/files/1/0441/2748/6119/files/parts_600x600.jpg?v=1627000489)
For starters we broke the four corners out away from the center. But to make them interlock, they would each have to donate a piece back to their three neighbors. After a lot of trial and error, we were able to determine the right angles that would let the four parts slide open simultaneously.
![](https://cdn.shopify.com/s/files/1/0441/2748/6119/files/assembly_600x600.gif?v=1627000512)
With this theory in place, it came down to printing it out and trying. Even at this stage, you can get a puzzle printed and then find out it is no challenge at all... or it functions but isn’t really any fun. It’s an unpredictable process. So there are a lot of “puzzles” on the shelf that will never be made for one reason or another.
![](https://cdn.shopify.com/s/files/1/0441/2748/6119/files/on_table_600x600.jpg?v=1627000560)
We’re stoked that the Tetra puzzle captures that little spark of joy that a good puzzle should. We’re thrilled to see it brought to life by our friends at Craighill. Thanks to them and almost 2 thousand backers on Kickstarer the Tetra puzzle will be available this winter.
![](https://cdn.shopify.com/s/files/1/0441/2748/6119/files/black_and_silver_600x600.jpg?v=1627000605)
For even more on the tetra puzzle and how it came to be check out the Kickstarter campaign here.