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 Daily Killer Sudoku 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.
• 'add / remove' - allows you 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 (if supported by your device)

• a or 0 = auto-pencil marks (or click 'pencil')
• p = show a pinned square
• CTRL + arrows = move around the grid
• SHIFT + # = highlight all squares with that digit
• SHIFT + 0 = clear all highlights
  
  
• '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).

Uniqueness

• This puzzle has exactly one correct answer.
• No guesses are ever required.
• Double-check alternative answers carefully, and then recheck the rules.

Combinations

• See all possible cage clues and combinations here.