This puzzle was based on a wooden block version by Dr Vladimir Krasnoukhov. You must fit all the pieces in the square with no overlap. Hold SHIFT and click a piece to rotate.

It is possible, I have done it. There is room to spare in the square, but there is only 4 solutions (representative of the same configuration rotated). The solution is elegant so you will know if you have it.

Go to Grand Illusions and buy the wooden version to test your friends.

Warning Spoiler!
Click to view the Russian Puzzle solution

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source: grand illusions