Killer Sudoku Blog

Resources for playing the game Killer Sudoku

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The 45 Rule in Killer Sudoku, Explained

Every row, column and box sums to 45 — and that one fact cracks cages open. The 45 rule explained with real grids: single regions, innies and outies, and the multiple-45 move that separates hard from expert.

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Killer Sudoku Tips: 9 Techniques, Ranked by What They Unlock

Nine Killer Sudoku techniques ordered by how much each one unlocks, from the unique cages worth memorizing to the multi-region 45 moves expert grids demand.

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How to Play Killer Sudoku — Rules, Cages, and Your First Solve

The three rules of Killer Sudoku, what cages actually tell you, and a complete beginner solve walked through grid by grid. No guessing required — ever.