|Packing per CTN||:||48(12)|
The idea for this puzzle comes from the "Horse" puzzle also available in the Cast Puzzle series.
The "Horse" puzzle was derived from a puzzle attained in California, one that was made with real horseshoes.
With the W-U puzzle, the difficulty is ramped up considerably over the original "Horse" puzzle.
I hope your frustration level ramps up, as well.
The key word is "hoof".