Killer Sudoku adds a twist to classic rules by combining logic with cage sums. You still place digits 1–9 without repeats, but each outlined cage must total a target number. This mode is perfect for players who enjoy extra constraints and richer deduction.
Start a killer puzzle instantly and refresh for unlimited new challenges. Use notes to track candidates and compare sums as you solve. If you want a more straightforward grid, head back to Classic or Easy Sudoku.