Daily Killer Sudoku 

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Note: take a look at the information about the difficulty levels.

All daily items change at midnight GMT. set time zone

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• Complete the grid such that every row, every column, and every 3 x 3 block contains the numbers from 1 to 9.
• Every cage has a little clue in the corner, and the numbers in each cage must add to the clue.
• A number can't appear more than once in a cage. Note: this is different to Calcudoku.

Read the help page on Killer Sudoku puzzles for the rules, and a more detailed explanation. I have provided a page that shows possible combinations

help

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Keyboard Options
If you are using a device without a physical keyboard, the on-screen keyboard is numeric, and 0 = auto-pencil marks (which can be disabled). If you prefer to use the default, non-numeric keyboard, you can select the option below the puzzle, and 0 ≠ auto-pencil marks. There is an option to add / remove characters. Entering the same character again will remove it (by removing all duplicates), and the contents are sorted.

Pencil Marks
What is a pencil mark? Pencil marks can help you keep track of your own thinking, simply enter more than one digit / letter into each square, just like you might do if you were using pen and paper. The size of the digits / letters is smaller when there is more than one digit / letter in a square. A square might contain more pencil mark digits / letters than can be shown.

Usage
Note: if supported by your device (and the cursor is in the grid).
a or 0 = auto-pencil marks (or click 'pencil').
p = show a pinned square.
CTRL + arrows = move around the grid.
SHIFT + digit = highlight all squares with that digit [SHIFT + 0 to clear].
'squares with' highlights all squares with that number as a pencil mark.

Checking
Once you have started the puzzle, if you click 'check' the system will check for single-digit squares that don't match the answer (squares with pencil marks are not checked). You have to select 'show mistakes' to see the mistakes.

Uniqueness
This puzzle has exactly one correct answer, which can be found using logical reasoning (i.e. no guesses are required). If you think that you have found another answer, then check it carefully, and then check the rules for a reason why it isn't allowed.

Combinations
See all possible cage clues and combinations here.

JavaScript
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