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

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

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

19-August-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.

19-August-2020

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

20-August-2020

- Digits do not repeat along the marked diagonals.

20-August-2020

- Digits do not repeat along the marked diagonals.

21-August-2020

- Digits do not repeat along the marked diagonals.

21-August-2020

- Digits do not repeat along the marked diagonals.

21-August-2020

- The arrows outside the grid indicate that the nearest three digits in the corresponding direction are in ascending or descending order (the highest number is always in the direction of the arrow). All possible arrows are given, so if there is no arrow, the first three digits do not form an increasing sequence in either direction.

21-August-2020

- The arrows outside the grid indicate that the nearest three digits in the corresponding direction are in ascending or descending order (the highest number is always in the direction of the arrow). All possible arrows are given, so if there is no arrow, the first three digits do not form an increasing sequence in either direction.

25-August-2020

- Grey cells in the grid represent many cloned areas. Digits in these areas on corresponding positions must be identical. Cloned areas are only moved, without rotation or reflection.

25-August-2020

- Grey cells in the grid represent many cloned areas. Digits in these areas on corresponding positions must be identical. Cloned areas are only moved, without rotation or reflection.

26-August-2020

- Digits do not repeat along the marked diagonals.

26-August-2020

- Digits do not repeat along the marked diagonals.

26-August-2020

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

26-August-2020

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

27-August-2020

- Digits do not repeat along the marked diagonals.

27-August-2020

- Digits do not repeat along the marked diagonals.

27-August-2020

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

27-August-2020

28-August-2020

- Grey cells in the grid represent many cloned areas. Digits in these areas on corresponding positions must be identical. Cloned areas are only moved, without rotation or reflection.

28-August-2020

29-August-2020

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

29-August-2020

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

30-August-2020

30-August-2020

31-August-2020

- Digits do not repeat along the marked diagonals.

31-August-2020

- Digits do not repeat along the marked diagonals.

31-August-2020

31-August-2020

31-August-2020

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

31-August-2020

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

31-August-2020

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

31-August-2020

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

2-September-2020

- Digits do not repeat along the marked diagonals.

2-September-2020

- Digits do not repeat along the marked diagonals.

2-September-2020

- Digits do not repeat along the marked diagonals.

2-September-2020

- Digits do not repeat along the marked diagonals.