Killer Sudoku
Rules
Fill the grid so that every column, every row and every 3x3 box contains the digits 1 to 9. The regions bordered with a dotted line are called "cages". The sum of all numbers in a cage has to be equal to the small number in its bottom left corner. No number may appear twice in a cage.
Sample puzzles
EASY
MEDIUM
HARD
EVIL
All puzzles © by puzzlephil
Variants — Special Killer Sudokus
These Killer Sudokus have irregular and/or additional coloured regions.
Extraregions Killer
Irregular Killer
Diagonal Killer
Colour Killer
More Sizes
Meaningful sizes vary between 6x6 and 16x16. Some puzzles do not have block regions like this 7x7 Killer Sudoku below.
