Twisted metal has never been so absorbing. Or quite so much fun. Take these cunning and ever-so-simple little devices, for instance. On the face of it, they're simply six pieces of metal, conjoined with other pieces to form a set of puzzles.

But look deeper and you'll see frustration and angst etched on the faces of their users around the dinner party table. Where even the one marked 'Medium' is raising eyebrows and raising the temperature of the occasion.

There are no simple puzzles in this set. There's nothing for the hard-of-thinking, and no handicap scheme to apologise for your lack of mental dexterity. So try taking a step up to the two puzzles notionally defined as 'Hard' and you'll endure a new tier of intellectual hardship and neuron pathway distortion as you battle the forces of bent metal to achieve supremacy.

But it's the final level of mental depravity that will get you most twisted of all - for this pair of seemingly insoluble challenges (they're the ones marked 'extra tough', by the way) will have you gasping for air, alcohol - or both.

The Twisted Puzzle Collection. Unputdownable. Infuriating. And very, very addictive.