Cunning puzzles on wits - puzzles- the occupation is not only fascinating, but also useful. This is a wonderful gym for the mind, developing mindfulness, logic, the ability to analyze, and even allowing you to enjoy the solution.

## Numerical puzzles

Hardly the most popular puzzle of our time is sudoku.

"Sudoku" in Japanese is "numbers standing apart".

This game is a square of 9x9, consisting of small squares of 3x3. In complex games squares can be more - 15x15, 25x25 and more. In several cells, the numbers are pre-set - this is the clue.

Puzzles, where additional conditions of the problem - numbers from 1 to 9 - are placed on diagonals, are called "Diagonal Sudoku", or, in the English version, Sudoku X. The method of solving the problem is like scanning - in the square the row is chosen, most filled with key numbers - the fewer empty cells, the easier it is to find the missing number.

Diagonal Sudoku, too, in turn, have different variations and combinations.

Diagonals can be large and small - in the main square, in blocks of small squares, angular and broken.

• Color diagonal - Sudoku, in which the numerical values ​​should be separately placed in each color block.
• The more complex diagonal-Sudoku is the antidiagonal - on the diagonals of the square there are only three different numbers.
• Pandiagonal square, in which the lines,columns and diagonals contain numbers from 1 to 25 - in such a Sudoku diagonal complex. It is interesting that it is impossible to compose a pandiagonal square of smaller dimensions. One of the numbers that does not exist in the selected row, in order of trying on all empty cells of the series. If there is no such number in the intersection of cells, it can be put in a cage. Do this operation until all the empty cells are filled. And we are checking on the columns, small squares 3x3 and diagonals, so that the numbers do not repeat.

Math skills in Sudoku decision is not required.

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