Colour Sudoku
Rules
Fill the grid so that every column, every row, every 3x3 box and all cells with the same colour contain the digits 1 to 9. The example on the side shows an Colour Sudoku with the digits 1 to 6.
Sample puzzles
EASY
MEDIUM
HARD
EVIL
All puzzles © by puzzlephil
See also other special Sudoku types.