What a nice trick lock made by Dan Feldman!
Especially when you know that it was made using an existing lock, which is far more impressive than creating a puzzle from scratch, because you have to modify with a lot of precision in such a way that the puzzle can still be opened, but with more moves!
The goal of this puzzle is to open the lock, not difficult to guess :-)
The original thing with this puzzle is that the lock is provided with a real key that is blocked and with another key broken (2 pieces).
How to use this broken key, you may wonder? Well just try things and don't be afraid: everything has been well thought. So you cannot loose anything nor damage the puzzle trying things. Not force however and not bangging!
To open the lock you cannot use the complete key, so you have to use your broken key!
To reassemble the puzzle you will not just do the same steps in another order, you will have to do other things.
Thus, the puzzle is not only opening it but also closing it, and I am sure you will have a lot of fun with it.
To conclude: a very nice puzzle, not difficult but with many tricks!
Do you prefer the A model or the B model?
If you had to choose 3 trick locks (from any designers) to bring on an island, what would they be? ;-)