# Types of Sudoku puzzles

### Diagonal

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3×3 regions. Additionally, each digit appears exactly once in each of the two main diagonals.

Sudoku Solution  ### Diagonal Even

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3×3 regions. Additionally, each digit appears exactly once in each of the two main diagonals and the grey squares in the grid must contain even digits.

Sudoku Solution  ### Diagonal Odd

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3×3 regions. Additionally, each digit appears exactly once in each of the two main diagonals and the grey squares in the grid must contain odd digits.

Sudoku Solution  ### Even

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3×3 regions. The grey squares must contain even digits.

Sudoku Solution  ### Irregular

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the irregularly shaped regions.

Sudoku Solution  ### Isosudoku

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, 9-cell diagonals and the nine outlined 3×3 regions. In the shorter diagonals all digits must be different.

Sudoku Solution  ### Killer

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3×3 regions. The sum of the numbers in each outlined region is equal to the corresponding number given in a corner of the outline. No digit is repeated within a given outlined region.

Sudoku Solution  ### Kropki

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3×3 regions. If absolute difference between two digits in neighbouring cells equals 1, then they are separated by a white dot. If the digit is a half of digit in the neighbouring cell, then they are separated by black dot. The dot between 1 and 2 can be either white or black.

Sudoku Solution  ### Little Killer

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and nine outlined 3×3 regions. Numbers with arrows indicate sum of the numbers in each direction.

Sudoku Solution  ### Lucky Seven

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3×3 regions. Additionally, each digit appears exactly once in each of the two main diagonals. All neighbouring cells linked with the line contain digits in arithmetical series (e.g. 234) or in a special one (e.g. 76567). Sudoku grid contains highlighted all the squares with even digits.

Sudoku Solution  ### Odd

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3×3 regions. The grey squares must contain odd digits.

Sudoku Solution  ### Parquet

Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the outlined squares 4×4, all 12 columns, all 12 rows, 9 top left corner, 9 central and 9 bottom right corner highlighted squares.

Sudoku Solution  