Killer Sudoku — printable PDFs

Killer Sudoku adds arithmetic to the logic. The grid is divided into dashed-line cages, each labelled with a target sum in the top-left corner. The digits inside a cage must add up to that sum, with no digit repeating inside the cage. The standard 1–9 row, column, and box rules all still apply on top. Expert-tier Killer puzzles start with zero given digits — the cage sums alone uniquely constrain the solution.

Rules: standard Sudoku rules plus each dashed cage must sum to its target, with no repeated digits inside the cage. Start with small cages (2–3 cells) where the possible digit combinations are limited — a two-cell cage summing to 3 must be 1+2, a three-cell cage summing to 6 must be 1+2+3.

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