Can you take the 2 G's apart? Can you put them back together? You can feel the weight of this brain teaser/ puzzle when you hold it. So you know that each piece is solid. It might look like a rugged design but a closer examination will reveal that it is quite sophisticated.
The puzzle has many possibilities. But as soon as you start trying to take it apart, you will notice the several protrusions that will hinder your path. This is the challenge that you must overcome.