The Cast Enigma Puzzle as you can probably guess from the name is hard.
The original design was patented in 1975 by Eldon Vaughn and it has been licensed for the Cast puzzle series.
It may take some patience to crack this but when you do the pieces should just slide apart.
Maria (verified owner) –
This puzzle is great! It is quite tricky, and even after solving it once it will likely take you many more times to figure out how to re-assemble and solve it again. Took us a good afternoon or two. Great to fiddle with! Really recommend!