Sudokus that no one can solve, not only including Sodukus which is very difficult but also that no one trying to solve it.

12-June-2020

- 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.

12-June-2020

- 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.

13-June-2020

- 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.

13-June-2020

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

13-June-2020

- The digits in two orthogonally adjacent cells cannot have a sum of either 5 or 10.

13-June-2020

- The digits in two orthogonally adjacent cells cannot have a sum of either 5 or 10.

13-June-2020

- The digits in two orthogonally adjacent cells cannot have a sum of either 5 or 10.

13-June-2020

- The digits in two orthogonally adjacent cells cannot have a sum of either 5 or 10.

13-June-2020

- Digits in adjacent cells cannot be consecutive.

13-June-2020

- Digits in adjacent cells cannot be consecutive.

13-June-2020

- Arrows and numbers outside gridding means how many different numbers in corresponding direction grid.

13-June-2020

- Arrows and numbers outside gridding means how many different numbers in corresponding direction grid.

13-June-2020

- The connected shaded cells contain each digit from 1 to 9.

13-June-2020

- The connected shaded cells contain each digit from 1 to 9.

13-June-2020

- The connected shaded cells contain each digit from 1 to 9.

13-June-2020

- The connected shaded cells contain each digit from 1 to 9.

13-June-2020

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

13-June-2020

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

13-June-2020

- Digits outside the grid indicate the sum of the first 3 digits in the corresponding direction.

13-June-2020

- Digits outside the grid indicate the sum of the first 3 digits in the corresponding direction.

13-June-2020

- Digits outside the grid indicate the sum of the first 3 digits in the corresponding direction.

13-June-2020

- Digits outside the grid indicate the sum of the first 3 digits in the corresponding direction.

15-June-2020

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

15-June-2020

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

15-June-2020

- Digits do not repeat along the marked diagonals.

15-June-2020

- Digits do not repeat along the marked diagonals.

15-June-2020

- There are some dots between cells. The numbers on each side of a dot must always be consecutive. Not all possible dots are marked.

15-June-2020

- There are some dots between cells. The numbers on each side of a dot must always be consecutive. Not all possible dots are marked.

15-June-2020

- Adjacent cells with digits summing to 5 are marked by V, while those summing to 10 are marked by X. All possible V and X are marked.

15-June-2020

- Adjacent cells with digits summing to 5 are marked by V, while those summing to 10 are marked by X. All possible V and X are marked.

15-June-2020

- Apply Classic Sudoku rules. Within each coloured region each digit must appear exactly once.

15-June-2020

- Apply Classic Sudoku rules. Within each coloured region each digit must appear exactly once.

15-June-2020

- Identical digits do not touch each other diagonally.

15-June-2020

- Identical digits do not touch each other diagonally.

15-June-2020

- Apply Classic Sudoku rules. Within each coloured region each digit must appear exactly once.

15-June-2020

- Apply Classic Sudoku rules. Within each coloured region each digit must appear exactly once.

15-June-2020

- Digits outside the grid indicate the sum of the first 3 digits in the corresponding direction.

15-June-2020

- Digits outside the grid indicate the sum of the first 3 digits in the corresponding direction.