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Innie

In a Killer Sudoku, an innie is a cell that does not belong to any of the selected cages, but lies inside the tested house(s). It is used in the 45 rule, a solving technique used for Killer Sudokus. The digit for a single innie can be calculated as follows:

(number of tested houses) x 45 - (sum of selected cages)

The orange cell r3c3 is an innie for nonet 1. Its value is 45 - (3 + 12 + 9 + 15) = 6.

See also

• Outie
• Innie-outie difference

This page was last modified 00:54, 2 August 2009.  

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