The Rubik's Cube is the world's most popular educational toy, but it is far from the most difficult puzzle.
There are much more complex tasks for developing logical thinking.
Bongard's "Problem of Recognition"
Its developer is Mikhail Moiseevich Bongard, a Russian cyberneticist.
The essence lies in comparing images with common features and those with differences.
The differences may be not only in shape or size, but even in color, purpose and properties of the depicted objects, and so on.
But this is not the most difficult task.
Sum-do-ku
Everyone has heard of Sudoku, but Sum-Do-Ku, which is called the “killer” of Sudoku, has additional numbers (sums of values) in the group.
However, the numbers in the group must not be repeated.
Kakuro Puzzle
It's a mix of sudoku, logic puzzles, math puzzles, and all with a touch of crosswords.
To solve it, you need to fill the cells with numbers from 1 to 9 horizontally and vertically.
In this case, the sum of the numbers in each block must match the given number and the numbers in the block must not be repeated.
It is considered the most difficult logic problem in the world.
Earlier we told you what the tallest chocolate sculpture looks like.
