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The Quandary is a classic puzzle. It really is very simple in principle, requiring two movements to set the small piece free. Both movements are distinct from each other, and finding one does not really help you in finding the next.

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The Sting is a strange little puzzle. Only one movement is required to separate the pieces. Some people discover the secret more quickly than others do, but the real challenge is getting to grips with the intricacies of these two identical shapes. This puzzle has a trap door leading to a dead end, and can be put back together in two different ways. If you put the pieces back together the opposite way around, a totally new solution is required to separate the pieces. We often hear people whisper ‘Ahh – I get it…’ when it turns out they really don’t get it at all.

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This puzzle is cheeky in the extreme. Our favourite puzzles are those with a simple solution that takes far longer to solve than it should. This one fits into that category very well indeed.

In days before keys and locks horsemen needed to find methods of 'locking their horses' if they fancied popping in for a swift pint on the way home. This classic horseshoe puzzle is one such result and is possibly the most famous classic puzzle in existence.

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The Puzzling Professors shut themselves away in their puzzle labs years ago. Ever since they have been working to invent the best puzzles for The Puzzling Professors' range. Which Professor do you think has created the trickest challenge? These puzzles are ideal for kids aged 6-12... and should be much too difficult for anyone older!

This collection brings together five of the best classic metal puzzles ever invented.

The Enigma Puzzle is a source of much frustration in our office. Some of our most qualified puzzlers just don't 'get' this puzzle. Rocket science it is not – but human brains don’t seem to react well to this tough little challenge. I’ve always wanted to test it on a chimpanze and see if humans really are just not cut out for this one. NOTE: Professor Puzzle Ltd does not support or tolerate the testing of products on animals… except in the case of that wacky man we once met who had trained his parrot to solve one of our nail puzzles… a very strange gentleman indeed.

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Puzzle locks - or ‘trick’ locks - this is no ordinary lock...

The world's most mystifying magician and greatest jailbreaking escape artist could crack any lock. Can you?!

Pit your wits against this puzzle in order to crack the lock!

These puzzles are ideal for kids aged 6-12... and should be much too difficult for anyone older!

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Disentangle the interlocking rings!

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We feel that the Menace can possibly be described as the greatest metal puzzle ever invented. It holds that very thing that humans hate most about non living objects – it is almost certainly cleverer than they are. If you have no patience, don’t buy it. If you have a very small brain, don’t buy it either. And if you fancy yourself as a bit of a problem solver, you may have met your match.

Separating these three identical pieces is just the beginning. The greatest challenge lies in understanding how to reassemble them correctly again. The solution is unique in the puzzling world, requiring three moves cunning enough to outwit the slyest fox.

We feel that the Menace Puzzle can possibly be described as the greatest metal puzzle ever invented. It holds that very thing that humans hate most about non living objects – it is almost certainly cleverer than they are. If you have no patience, don’t buy it. If you have a very small brain, don’t buy the Menace metal Puzzle. And if you fancy yourself as a bit of a problem solver, you may have met your match. The genius of this Menace Puzzle is the fact that a toddler could reconnect the pieces when separated in seconds. But once connected they are seemingly impossible to separate again.

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This puzzle looks nice and friendly in it’s packaging... but is actually a most vindictive creation. It can fairly claim it’s brilliance through the simplicity of it’s design. Simple to solve though it is not.