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Killer Sudoku is a challenging variant of classic sudoku. It combines the logic of sudoku with elements of kakuro: the grid is divided into cages, each with a given sum, and you must fill the cells with digits 1 to 9 without repeating any number in a row, column, or cage. Unlike regular sudoku, no starting numbers are given—only the cage totals.

In this video, I walk you through a full Killer Sudoku puzzle from start to finish. I explain the logic behind each move, how to use cage sums effectively, and how to avoid common mistakes. Whether you're new to Killer Sudoku or want to improve your skills, this step-by-step guide will help you understand and solve even the trickier puzzles.