Sudoku
Rules
Fill the grid so that every row, every column and every 3x3 box contains the digits from 1 to 9 exactly once.
Sample puzzles
EASY
MEDIUM
HARD
EVIL
All puzzles © by puzzlephil
Irregular Sudokus or Jigsaw Sudokus
Irregular Sudokus have nine irregular regions instead of the 3x3 blocks in which each number form 1 to 9 has to appear exactly once.
Irregular - easy
Irregular - medium
Irregular - hard
Irregular - evil
Extraregions Sudokus
These Sudokus have a few extra regions in which each number form 1 to 9 has to appear exactly once.
Extraregions - easy
Extraregions - medium
Extraregions - hard
Extraregions - evil
Colour Sudokus
In Colour Sudokus it also applies to all cells of the same colour that they have to contain each digit from 1 to 9 eactly once.
Colour Sudoku - easy
Colour Sudoku - medium
Colour Sudoku - hard
Colour Sudoku - evil
Diagonal Sudokus
In Diagonal Sudokus also the two diagonals have to contain each digit from 1 to 9 eactly once.
