Killer Sudoku.

Same grid. A different way to think.

Fill each row, column, and 3 × 3 box with 1–9. The digits in each dashed cage must add up to its small total, without repeating. A one-cell cage gives you its digit directly. Larger cages offer fewer immediate clues. Each puzzle is checked for exactly one solution using all cage and Sudoku rules.

Killer levels use cage size and cage count, rather than the Classic technique grading. No hints, automatic notes, or auto-solve.