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 The Daily Mini Killer Sudoku #42, September 11 Difficulty level: Moderate Please click on NEW to get todays puzzle! (Midnight is EST (GMT-5)) All-Access Supporterscan play all four grades

Prefill notes and Auto Clear
• Prefill will place 1 to 9 in any empty cell. Useful at the start of play of you prefer to remove candidates rather than add them. Optional to use.
• Auto Clear will remove notes when you place a solution in a cell or when turned on for the first time. You can toggle on and off if you want a temporary clear-off. Optional to use.
• Good idea or bad? Let me know andrew@str8ts.com
Keyboard instructions:
• You can now navigate with the arrow keys
• 0, Del or Backspace will delete all notes
• N or space = Toggle Notes. On a single 'note' will toggle that number large
• Buttons with an underscore mean keyboard activation with that letter
• CRTL+z = undo, CTRL+y = redo
• Popups can be dismissed with 'Enter'. 'Escape' for cancel

Grades cycle from Gentle to Diabolical
A list of Cage Combinations is available, and you should also be aware of the Killer Cage Convention.

How to play Mini Killer Sudoku

Mini Killer is based on 6x6 Sudoku, so ultimately you need to place the numbers 1 to 6 on all the cell so that 1 to 6 is unique in every row, column and box. However, you will have few, if any, completed cells in Killer. Instead, groups of cells form blocks or 'cages' - and the clue is the sum of the solutions to those squares. Each 'cage' is shown by a color or dashed line. A clue of '3' in a two-cell cage means those cells will contain 1 and 2 - but it won't be obvious which way round at the start of the puzzle.

Combinations are key to this puzzle at the outset, but all Sudoku strategies still apply. For more information take a look at these pages: Cell Combinations, Innies and Outies and Cage Splitting.

 Note: I am sending the 6x6 Mini Killer to the KenDoku solver since they are intrinsically the same puzzle, just that Mini Killer are all + operators while KenDoku has all four arithmetic operators. This does mean the grade will be very different as it is applying Kendoku calibrated bands.