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Today Sudoku contains very many types of variant Sudoku, more types of Sudoku puzzles are still under continuous development, please continue to pay attention to Sudoku today.

Today's Sudoku

Quadruple sudoku

• 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 3x3 regions.
• Each set of four digits in the intersection of two lines indicates the digits that have to be placed in the four adjacent cells.

Quadruple sudoku

• 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 3x3 regions.
• Each set of four digits in the intersection of two lines indicates the digits that have to be placed in the four adjacent cells.

Color Sudoku

• 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 3x3 regions.
• Apply Classic Sudoku rules. Within each coloured region each digit must appear exactly once.

Color Sudoku

• 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 3x3 regions.
• Apply Classic Sudoku rules. Within each coloured region each digit must appear exactly once.

Non XV sudoku

• 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 3x3 regions.
• The digits in two orthogonally adjacent cells cannot have a sum of either 5 or 10.

Non XV sudoku

• 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 3x3 regions.
• The digits in two orthogonally adjacent cells cannot have a sum of either 5 or 10.

No Touch Sudoku

• 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 3x3 regions.
• Identical digits do not touch each other diagonally.

No Touch Sudoku

• 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 3x3 regions.
• Identical digits do not touch each other diagonally.

Fortress Sudoku

• 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 3x3 regions.
• If a shaded cell and a white cell are adjacent then the digit in the shaded cell is greater.

Fortress Sudoku

• 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 3x3 regions.
• If a shaded cell and a white cell are adjacent then the digit in the shaded cell is greater.

Give me Five Sudoku

• 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 3x3 regions.
• Sum and difference of two orthogonally adjacent numbers must not be 5.

Give me Five Sudoku

• 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 3x3 regions.
• Sum and difference of two orthogonally adjacent numbers must not be 5.

Edge Difference Sudoku

• 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 3x3 regions.
• A number at the edge of the diagram indicates the difference between the first and the last number in the corresponding row or column.

Edge Difference Sudoku

• 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 3x3 regions.
• A number at the edge of the diagram indicates the difference between the first and the last number in the corresponding row or column.

Non XV sudoku

• 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 3x3 regions.
• The digits in two orthogonally adjacent cells cannot have a sum of either 5 or 10.

Non XV sudoku

• 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 3x3 regions.
• The digits in two orthogonally adjacent cells cannot have a sum of either 5 or 10.

Greater Than Sudoku

• 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 3x3 regions.
• Digits have to be place in accordance with the “greater than” signs.

Greater Than Sudoku

• 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 3x3 regions.
• Digits have to be place in accordance with the “greater than” signs.

Windoku

• 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 3x3 regions.
• Each of the four shaded 3x3 boxes contains each digit from 1 to 9.

Windoku

• 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 3x3 regions.
• Each of the four shaded 3x3 boxes contains each digit from 1 to 9.

Quad Sums Sudoku

• 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 3x3 regions.
• One of the numbers in the four cells around a dot is the num of the other three numbers.

Quad Sums Sudoku

• 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 3x3 regions.
• One of the numbers in the four cells around a dot is the num of the other three numbers.

Answer 8 sudoku

• 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 3x3 regions.
• A dot between two cells indicates that the result of at least one of the basic operations (addition, subtraction, multiplication, division) of the numbers in these two cells is 8. Is the dot missing, no one of the basic operations results in an 8.

Answer 8 sudoku

• 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 3x3 regions.
• A dot between two cells indicates that the result of at least one of the basic operations (addition, subtraction, multiplication, division) of the numbers in these two cells is 8. Is the dot missing, no one of the basic operations results in an 8.

Group Sum Sudoku

• 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 3x3 regions.
• Each number at the intersection of four cells is the sum of digits in those four cells.

Group Sum Sudoku

• 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 3x3 regions.
• Each number at the intersection of four cells is the sum of digits in those four cells.

Multi Diagonal Sudoku

• 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 3x3 regions.
• Digits do not repeat along the marked diagonals.

Multi Diagonal Sudoku

• 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 3x3 regions.
• Digits do not repeat along the marked diagonals.

Greater Than Sudoku

• 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 3x3 regions.
• Digits have to be place in accordance with the “greater than” signs.

Greater Than Sudoku

• 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 3x3 regions.
• Digits have to be place in accordance with the “greater than” signs.

Odd Sudoku

• 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 3x3 regions.
• Cells with shaded circles contain odd digits.

Odd Sudoku

• 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 3x3 regions.
• Cells with shaded circles contain odd digits.

Quadruple sudoku

• 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 3x3 regions.
• Each set of four digits in the intersection of two lines indicates the digits that have to be placed in the four adjacent cells.

Quadruple sudoku

• 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 3x3 regions.
• Each set of four digits in the intersection of two lines indicates the digits that have to be placed in the four adjacent cells.

Skyscrapers Sudoku

• 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 3x3 regions.
• Consider each number to be the height of a building. The numbers outside the grid indicate how many buildings can be seen when looking in that direction (taller buildings conceal smaller buildings behind them).

Skyscrapers Sudoku

• 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 3x3 regions.
• Consider each number to be the height of a building. The numbers outside the grid indicate how many buildings can be seen when looking in that direction (taller buildings conceal smaller buildings behind them).

Differences Sudoku

• 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 3x3 regions.
• A number between two cells indicates the difference of the numbers in these cells. A number between four cells indicates the difference between two diagonally adjacent cells, either top left + right bottom (\) or top right + bottom left (/). If one of the characters < or > is specified the apex of the angle points to the smaller of these numbers.

Differences Sudoku

• 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 3x3 regions.
• A number between two cells indicates the difference of the numbers in these cells. A number between four cells indicates the difference between two diagonally adjacent cells, either top left + right bottom (\) or top right + bottom left (/). If one of the characters < or > is specified the apex of the angle points to the smaller of these numbers.

X Sums Sudoku

• 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 3x3 regions.
• Each number outside the grid is the sum of the first X numbers placed in the corresponding direction, where X is equal to the first number placed in that direction.

X Sums Sudoku

• 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 3x3 regions.
• Each number outside the grid is the sum of the first X numbers placed in the corresponding direction, where X is equal to the first number placed in that direction.