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This puzzle is based on the centuries old classic bent nails puzzle.

Slightly more difficult than the Nail Biter.

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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!

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This classic horseshoe puzzle is possibly the most famous classic puzzle in existence. As you'd expect from Hanayama cast puzzles the quality and finish is of an excellent standard. A nice puzzle to ignite your puzzling passion.

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A timeless classic, the Bike puzzle from Hanayama is guaranteed to keep your attention as you navigate the metal ring round the bike.

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Remove the 'C' and then...bring it back to start! As you can see, the letters A, B, and C. The key word to keep in mind here is “tracks.” In this puzzle you are trying to free the C from the AB piece. Taking the wrong route will lead to a dead end, so to speak. Based on a puzzle that came out back in 1911 in England, this puzzle has a lot of history behind it. Hanayama classify this as a level 1 puzzle. 1 being the easiest and 6 being the hardest.

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Two keys linked together in such a way as to seem permanently joined. No matter how you look at it, there seems to be no possible way to separate them…or so everyone thinks.

Keeping in mind the idea of intersecting the 'flags' should help in tackling this one. Hanayama classify this as a level 1 puzzle. 1 being the easiest and 6 being the hardest.

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A salmon shark playing with an old fossilized shark. Once you have helped it escape, put it back together again. Hanayama classify this as a level 1 puzzle. 1 being the easiest and 6 being the hardest.

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A sea bream and horse mackerel enjoying themselves getting tangled up together. Take them apart, and then put them back together again. Hanayama classify this as a level 1 puzzle. 1 being the easiest and 6 being the hardest.

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If you manage to separate these two nails reasonably quickly don't be too quick to congratulate yourself.

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.