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 (0 = auto-pencil marks).
• 'use default' ➞ use the default, non-numeric keyboard (0 ≠ auto-pencil marks).
• 'disable 0' ➞ disable the 0 for auto-pencil marks.
• 'add / remove' ➞ add / remove characters, entering the same character again will remove it (by removing all duplicates and sorting).

Pencil Marks

• Pencil marks are squares with more than one digit or letter.
• They are similar to those you might use with pen and paper.
• A square might contain more pencil marks than can be seen.

Usage (if supported by your device)

• a or 0 ➞ auto-place pencil marks.
• p ➞ show a pinned square.
• CTRL + arrows ➞ move around the grid.
• SHIFT + # ➞ highlight all squares with that number.
• SHIFT + 0 ➞ clear highlighted squares.
  
  
• 'squares with' ➞ highlight all squares with that number as a pencil mark.

Checking

• 'check' ➞ check for incorrect squares.
• 'show mistakes' ➞ highlight incorrect squares when the puzzle is checked.
• What is checked:
     a single number that isn't the same as the answer,
     squares with pencil marks are not checked.

Uniqueness

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

Combinations

• See all possible cage clues and combinations here.