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

21-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.
- Digits do not repeat along the marked diagonals.

21-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.
- Digits do not repeat along the marked diagonals.

21-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.

21-June-2020

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

21-June-2020

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

21-June-2020

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

22-June-2020

- Digits do not repeat along the marked diagonals.

22-June-2020

- Digits do not repeat along the marked diagonals.

22-June-2020

- Digits do not repeat along the marked diagonals.

22-June-2020

- Digits do not repeat along the marked diagonals.

22-June-2020

- The four corner boxes contain the same digit in symmetric positions about the centre.

22-June-2020

- The four corner boxes contain the same digit in symmetric positions about the centre.

22-June-2020

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

22-June-2020

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

22-June-2020

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

22-June-2020

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

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

- Digits do not repeat along the marked diagonals.

23-June-2020

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

23-June-2020

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

23-June-2020

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

23-June-2020

23-June-2020

- The four corner boxes contain the same digit in symmetric positions about the centre.

23-June-2020

- The four corner boxes contain the same digit in symmetric positions about the centre.

23-June-2020

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

23-June-2020

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

23-June-2020

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

23-June-2020

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

23-June-2020

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

23-June-2020

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