This puzzle is based on the centuries old classic bent nails puzzle. Nobody is sure where it was invented, but it has been amazing puzzlers ever since with its infuriating mix of difficulty and simplicity. This version has an added twist to make it doubly difficult to solve. Can you separate the two nail pieces, and put them back together again? Separating two bent nails…it can't be that hard can it? Well actually yes! There are few things more pleasing than watching people who believe they know everything humbled by such a simple feat of puzzle engineering.