Sudoku with cage sums — free online or as a large-print book
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Fill 1–9 once per row, column and 3×3 box. The dashed cages show a SUM; no digit repeats inside a cage. No given numbers. Tap a cell, then a number.
How Killer Sudoku works
Killer Sudoku is normal Sudoku (1–9 once per row, column and 3×3 box) with no starting numbers. The grid is split into dashed cages; the small number is the SUM of that cage, and no digit repeats inside a cage. The sums alone lead to one unique logical solution.
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Prefer paper?
Large Print Killer Sudoku — 100 puzzles per volume (Easy to Hard), as a paperback (also in German).