"Alcatraz - The Puzzle" is one extremely difficult puzzle, which is unsolvable, unless you already know the concept inside.
Many people state that this is not a puzzle, but rather a magical trick or something like that. Personally I think it is a puzzle, although not a regular one.
So, there is a cage with a ball inside. There are six columns around the ball, two of them keeping it tightly inside, while the other four could be rotated around their center axis, but cannot be removed from between the top and bottom of the puzzle. There is also a website devoted to this small little puzzle, and I am sure you will check it before you solve it by yourself. There, you will find more information about the structure of the puzzle and the solution.
To be able to solve a very difficult puzzle you need usually luck the first time you try it. Then, you have to see how the solution works and apply it the next time. For "Alcatraz - The Puzzle" this is not the case. Here, you cannot solve it at all accidentally the first time. Well, unless you see someone do the magic trick and then by observing their movements, try to do something similar. Then, and just then, accident could happen and you may solve it by chance. And I think this is how you should become acquainted to this puzzle. Otherwise, you have to cheat.
This is what I did - I cheated for this puzzle. And it is the puzzle I never regret I cheated. It is also the puzzle I never what to solve again, as it is not very pleasant for me. I do admire the idea and implementation, though, but this is not enough to make me like that puzzle at all.
This is my personal opinion for "Alcatraz - The Puzzle". It is suitable to see someone else take the ball out of the cage and then try to find out how. But if you are going to buy it for your collection with no demonstration about it - then I suggest you just don't do it. Spare yourself and get something much more interesting and fun.
My rating are:
Overall: 3.75 (too high, after all)