Source: www.sudoku-puzzles.net

Sudoku - also known as "Number Place" - is a logic-based, combinatorial number-placement puzzle. The aim of Sudoku is to enter a number from 1 through 9 in each cell of a grid, most frequently a 9×9 grid made up of 3×3 subgrids. Each row, column and region must contain only one instance of each number.

There are 19 different types of Sudoku.

Sudoku - also known as "Number Place" - is a logic-based, combinatorial number-placement puzzle. The aim of Sudoku is to enter a number from 1 through 9 in each cell of a grid, most frequently a 9×9 grid made up of 3×3 subgrids. Each row, column and region must contain only one instance of each number.

The puzzle consists of four 9×9 grids. The numbers must be placed correctly for all four grids.

Easy as ABC - also known as "ABC End View" or "Last Man Standing" - is a logical puzzle played on a square grid. The objective of Easy as ABC is to fill the grid with the letters A through G (or whatever the grid dimension is). Each row and each column must contain only one instance of each letter. The clues outside the grid show which letter comes across first from that direction.

Sudoku - also known as "Number Place" - is a logic-based, combinatorial number-placement puzzle. The aim of Sudoku is to enter a number from 1 through 9 in each cell of a grid, most frequently a 9×9 grid made up of 3×3 subgrids. Each row, column and region must contain only one instance of each number.

There are 19 different types of Sudoku.

- Sudoku
- Argyle Sudoku
- Asterisk Sudoku
- Binario
- Butterfly Sudoku
- Center Dot Sudoku
- Easy as ABC
- Even-Odd Sudoku
- Flower Sudoku
- Futoshiki
- Girandola Sudoku
- Hoshi Sudoku
- Killer Sudoku
- Samurai Sudoku
- Mathdoku
- Sudoku X
- Tripledoku
- Twodoku
- Windowku

**Sudoku**Sudoku - also known as "Number Place" - is a logic-based, combinatorial number-placement puzzle. The aim of Sudoku is to enter a number from 1 through 9 in each cell of a grid, most frequently a 9×9 grid made up of 3×3 subgrids. Each row, column and region must contain only one instance of each number.

**Argyle Sudoku***This "Argyle Sudoku" is a Sudoku variant . It contains additional marked diagonals that must also contain the digits 1 through 9 exactly once.**Asterisk Sudoku***It contains an additional area of nine specially marked cells. Those nine cells must also contain the digits 1 to 9 exactly once.****Binario***Binairo - also known as "Binary Puzzle", "Takuzu" or "Tohu wa Vohu" - is a logical puzzle played on a square grid. The objective of Binairo is to fill the grid with the numbers 1 and 0. Each row and each column must be unique.**In addition, there have to be as many "1" as "0" in every row and every column (or one more for odd sized grids) and no more than two cells in a row can contain the same digit.**Butterfly Sudoku*The puzzle consists of four 9×9 grids. The numbers must be placed correctly for all four grids.

**Center Dot Sudoku***The central cells of each region form an extra region that must also contain the numbers 1 through 9.This is called Center Dot Sudoku.*

**Easy as ABC**Easy as ABC - also known as "ABC End View" or "Last Man Standing" - is a logical puzzle played on a square grid. The objective of Easy as ABC is to fill the grid with the letters A through G (or whatever the grid dimension is). Each row and each column must contain only one instance of each letter. The clues outside the grid show which letter comes across first from that direction.

*Even-Odd Sudoku**In this variant white cells must contain odd digits and gray cells must contain even digits.*

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