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Competitions 
 Killer Sudoku Weekly Competition Advance puzzles are now available Now available for your iPhone Cool Sudoku Visit our site to see the great iPhone application that brings you Sudoku, Killer, Jigsaw, Kakuro and Mini Sudoku to your iPhone/iPod Touch. We are running Daily Competitions and will be supporting a leader board for each puzzle type. Click to go to the Cool Sudoku Site or use the Button below to view in iTunes #690, December 8 to December 14:
Extreme Killer Sudoku Puzzle

 8 11 15 21 18 14 16 15 12 7 3 9 19 21 11 11 7 15 11 6 18 17 15 15 11 8 15 21 13 8 14
Extreme

Cage Combinations

PRINTABLE VERSION: CLICK HERE FOR BLACK AND WHITE - HERE FOR COLOUR

WARNING: You are on the Weekly 'Extreme' Killer Sudoku Sudoku Page.

Killer Sudoku is a fiendish variant of Sudoku - the same 9 x 9 board with rows, columns and nine boxes that must be filled in with all the numbers 1 to 9. But instead of seeing some starter clues where some cells are completed for you, in killer sudoku areas of the grid are "caged". Each cage contains a single number which is the sum of all the solutions in that shape. You have to use this information to crack the Sudoku, but all the normal strategies of Sudoku still apply.

A cage of two cells containing a target of 3 will must contain cells with the value 1 and 2. (We conform to the Killer convention that no cage will contain a duplicate number even if it is within the rules of sudoku). Killers strategies are explained on our forum here and on this external site here. A list of Cage/Value combinations is available here.

All Extreme puzzles have a single solution and at least one logical solve path, although this might be obscure to say the least.
The deadline is Saturday night, any time up to midnight.

To play the Weekly Killer Sudoku Competition,
enter your solution for the Killer puzzle here:

 How to enter a solution: You should type or Copy and Paste 81 numbers here. They can be in a square or in one long line. All punctuation, white space and line feeds are ignored - so it does not have to be 'clean'. We'll check that it contains 81 numbers before submitting. Time Taken Do let us know how long this took or give us your own rating

To Uniquely identify your history we need:
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Tick this box to save details in a cookie

## Last weeks's Solution: Extreme no. 689

 5 4 6 7 8 9 2 3 1 8 2 9 1 3 4 5 7 6 1 7 3 6 5 2 9 8 4 4 8 7 2 6 1 3 5 9 3 6 2 4 9 5 7 1 8 9 1 5 3 7 8 6 4 2 7 5 4 8 2 6 1 9 3 2 3 1 9 4 7 8 6 5 6 9 8 5 1 3 4 2 7

## Archive

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Number 690: Puzzle - Need help with your Puzzle solving In addition to our solvers we also offer utilities to help you solve various puzzles. One example is out Killer/Kakuro possible value calculator.

Extreme Sudoku | Jigsaw | Killer Online SUDOKU - Play Sudoku Online NOW. All grades available.  Play Jigsaw Sudoku Online  Play Killer Sudoku Online  Play Kakuro Online 