Put the whole square in the bag! This puzzle was chosen "Puzzle of the year" in the Nob Yoshigahara Puzzle Design Competition 2012. Great combination of two opposite materials - solid and soft ones.

The puzzle appeared around 1905. It was known as "Devil's Claws". This high-quality replica by Hanayama company from Japan almost a hundred years later possesses the same deceitful feeling - it looks simple but requires one's patience and persistence to take the two pieces apart.

Though the puzzle is strongly associated with Czech Republic (in Czech: Ježek v kleci), it has its origins in the USA. The first known patent to its model was obtained by American inventor Clarence A. Worrall in Philadelphia, PA, in 1896. The puzzle arrived in Czechoslovakia around 1935 and entertained huge popularity in the country as an organic part of one of the most successful Czech comics - Rychlé šípy (Rapid Arrows). Can be in plastic, metal or wood versions; and the object is "simple" - take the "hedgehog" out of the "cage".

Yes, only one wooden cube has to be "packed" into the box! Despite such a straightforward goal, the cube doesn't want to go fully into the box easily. The reason? There are some magnets embedded in the box and the cube. Puzzlers' Award at the very first annual Nob Yoshigahara Puzzle Design Competition in 2001.

Another puzzle gem from Hanayama cast series. Take the two symbols apart. Put them back together. Both challenges are not trivial. Don't try to rush this one - take your time and enjoy the "Vita Dolce!"

The "G clef" and "eighth note" intertwine and give off a beautiful note as if they're playing music. Invented by two Russian designers. It took Hanayama company a couple of years to figure out how to produce the G clef. They finally figured it out to the delight of all puzzlers so that the process of taking the two pieces apart doesn't result in the break of any piece.

This puzzle opens the Top-3 of the chart. Two identically twisted nails are to be taken apart. Echoing pick #8 from this list, it is known probably for the same period of time - over a century.

For decades this puzzle was an undisputed #1 in the realm of the 2-piece puzzles before the new #1 claimed the spot recently. Two identical pieces have to be assembled into a tetrahedron or a 4-sided pyramid.

Appeared a decade ago, the puzzle managed to grasp the top position among the 2-piece puzzles - both in recognition and perception. A young Finnish designer has come up with the concept based on an original puzzle ring he created for his girlfriend - just assemble the two pieces into the cast loop! Great design, precise manufacturing and a special magnet click - all together make this puzzle a special jewel in the series.