Hard Difficulty IQ Metal Puzzles

There are over 60 different IQ metal puzzle designs with differing levels of difficulty. This section contains what we would consider the "hard" puzzles (HIGH difficulty). Ideally suited to the determined puzzler seeking a real challenge. 

Remember - just because some people will find these "hard", does not mean everyone will. You might get lucky. And then realise you have to do the challenge in reverse and reassemble the pieces...