Killer Sudoku instructions and free Killer Sudoku puzzles to play online

Killer Sudoku instructions and free Killer Sudoku puzzles to play online

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A Year of Killer Sudoku — 365 Puzzles, 5 Levels of Difficulty: No 1

What am I missing here? I've applied all the rules I know in

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Your attention. Killer sudoku, hard level, #007

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