When Two Become One

What does it mean  when two  ...

... become one?

It means you know how to solve the puzzle.   :)

Thanks to MyGirl's godmother, we have added a new one to the collection.

It's the Hanayama CAST RING II.  Difficulty Level = 5.  And it's quite amazing.

MyGirl has discovered its secret.  I still have to sit down and figure out the solution.

There was a flier in the box, so we now know what to call the puzzles on the fourth row from the top (left to right).

1.  CAST HORSE (difficult level = 2) 

2.  CAST STAR (difficulty = 3) 

3.  CAST RING (difficulty = 4)

4.  CAST RING II (difficulty = 5)

P.S.  I think that the base pieces of this collection actually belong to Slash-M.  If you're looking for your toys, Slash-M, they're with me.  MyGirl is now at the age where she can appreciate playing with them.