The Rule of 45 of Killer Sudoku (innies and outies)
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This tip is probably the most important solving technique of Killer Sudoku, one that will save you a lot of time. It does involve some math, but very simple one. Basically, the whole story is that …

The Rule of 45 of Killer Sudoku (innies and outies)

Killer sudoku - Wikiwand

Killer Solving Guide

Getting started on this killer sudoku via outies : r/sudoku

JSudoku - Innies/Outies Techniques

JSudoku - Innies/Outies Techniques

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Innies and Outies

Sudoku Solver - Killer Sudoku Multiple 45 Rule Solving Technique

Innies and Outies

Cage Unit Overlap

Killer sudoku help. I've tried the 45 rule so much and must be missing something : r/puzzles

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